Exabyte EXB-8505 8mm Product Specification
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Exabyte EXB-8505 8mm Product Specification

Standard and extended-length configuration
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  • Page 1 (;%0;538#)#(;%0;838#;PP# 7DSH#'ULYHV VWDQGDUG#DQG#H;WHQGHG0/HQJWK#FRQILJXUDWLRQV 3URGXFW 6SHFLILFDWLRQ 510504-002...

  • Page 2: Trademark Notices

    Copyright 1994 by Exabyte Corporation. All rights reserved. This item and the information contained herein are the property of Exabyte Corporation. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language in any form or by any...
  • Page 3 This revision (510504-002) of the EXB-8205 and EXB-8505 Product Specification for Standard and eXtended Length (XL) Configurations replaces the EXB-8205 8mm Cartridge Tape Subsystem Product Specification (510703) and the EXB-8505 8mm Cartridge Tape Subsystem Product Specification (510504). This manual includes the following changes and enhancements: The manual has been reorganized for easier reference.

  • Page 4: Product Warranty Caution

    Exabyte’s personnel or agent for the applicable equipment. Use of any type of cleaning material other than an EXABYTE 8mm Cleaning Cartridge (or an Exabyte-approved cleaning cartridge). Modifications by other than Exabyte’s personnel or agent in any way...

  • Page 5: Table Of Contents

    Data Cartridges ......1-20 Exabyte Cleaning Cartridges ......1-22 Recording Format Helical-Scan Recording .
  • Page 6 Functional Description Write Operations ........3-2 Data Flow and Data Compression .
  • Page 7 Functional Specifications Performance Specifications ....... . . 6-2 Write Access Time ........6-2 Read Access Time .
  • Page 8 Figures Features Figure 1-1 Comparison of the four tape drives ..... . 1-3 Figure 1-2 Front panel ........1-9 Figure 1-3 Label location and content .
  • Page 9 Functional Specifications Figure 6-1 Power connector location on the back panel ....6-13 Figure 6-2 Chassis ground location on back panel ....6-14 Figure 6-3 Temperature and humidity ranges for operation .
  • Page 10 Table 1-1 Comparison of tape drive features ..... . . 1-4 Table 1-2 Read/write compatibility of Exabyte 8mm tape drives ... 1-5 Table 1-3 Data format features .

  • Page 11: About This Manual

    How This Manual is Organized This manual contains the following chapters: Chapter 1 describes the features of the tape drives, including compatibility with other Exabyte 8mm Cartridge Tape Subsystems, data compression, tape capacity, and custom EEPROM options. This chapter also describes the physical features of the tape drives, including mechanical and electrical components.

  • Page 12: Related Publications

    EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL, and for information about implementing SCSI commands, refer to the following publications: EXB-8205 and EXB-8505 8mm Cartridge Tape Subsystems SCSI Reference for Standard and eXtended Length Configurations, 510503 EXB-8205 and EXB-8505 8mm Cartridge Tape Subsystems...

  • Page 13: Conventions Used In This Specification

    Standards For information about the standards used for the tape drives, refer to the following publications: ANSI Small Computer System Interface (SCSI), X3.131 - 1989 ANSI Small Computer System Interface-2 (SCSI-2), X3.131 -1994 ANSI/ISO/IEC 11319-1992 and ECMA-145, Information Technology —8mm Wide Magnetic Tape Cartridge for Information Interchange, July 1992 ISO/IEC 12246 and ECMA-169, Information Technology—8mm Wide Magnetic Tape Cartridge Dual Azimuth Format for...
  • Page 14 Notes: EXB-8205 and EXB-8505 510504 (Standard and XL)

  • Page 15: Features

    Features This chapter provides an overview of the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL, including: Features Physical description Related products May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 16: Features

    1 Features Features The EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL are enhanced 8mm digital helical-scan cartridge tape subsystems (tape drives). The tape drives are packaged in the industry standard 5.25-inch half-high form factor, which allows for ease of integration across a multitude of platforms.

  • Page 17: Figure 1-1 Comparison Of The Four Tape Drives

    Figure 1-1 Comparison of the four tape drives The EXB-8205XL and EXB-8505XL are fully compatible with the EXB-8205 and EXB-8505; each extended length tape drive supports all of the tape sizes and data formats supported by the corresponding standard tape drive. You can distinguish an extended length tape drive from a standard tape drive by checking the unload button.

  • Page 18: Table 1-1 Comparison Of Tape Drive Features

    Read/Write Compatibility with Other Tape Drives The EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL can read data cartridges written by other Exabyte 8mm tape drives, including the EXB-8200, the EXB-8200SX, the EXB-8500, and the EXB-8500c. They can also write on data cartridges that are intended for use with these other tape drives.

  • Page 19: Table 1-2 Read/Write Compatibility Of Exabyte 8Mm Tape Drives

    Table 1-2 Read/write compatibility of Exabyte 8mm tape drives A tape written in this format... EXB-8205 8200 8200c 8500 8500c Table 1-3 Data format features 8200 format Maximum sustained data transfer rate KBytes/sec Maximum capacity on 112m tape GBytes Maximum capacity...

  • Page 20: Data Compression

    Improved Data Recording Capability (IDRC) algorithm. Licensed from IBM, this algorithm is the de facto standard in mainframe environments. The tape drives also use the Exabyte Compression Integrity Check™ feature to ensure that data is accurately compressed and decompressed into the original form sent by the initiator.

  • Page 21: Custom Eeprom Options

    MODE SELECT power-on default values, command set options, hardware operation options, and SCSI configuration options. When you order a tape drive, you can contact an Exabyte account manager to select which, if any, EEPROM settings you want to change from their standard settings.

  • Page 22: Storage Capacity

    1 Features Storage Capacity Table 1-4 lists the approximate storage capacities of 8mm data cartridges written in the four logical formats. For more information on EXATAPE 8mm data cartridges, see page 1-20. Table 1-4 Approximate capacities of EXATAPE data cartridges Length of EXATAPE 8500c...

  • Page 23: Physical Description

    Figure 1-2 Front panel Door and Bezel Standard colors for the door and bezel include black, pearl white, pebble gray, platinum, and gray. Exabyte can provide custom colors at an additional cost. (Contact your account manager for more information.) May 1994...

  • Page 24: Figure 1-3 Label Location And Content

    See Chapter 4 for more information about the LED functions. Labels All Exabyte products are required to include standard process, configuration, and agency labels. Figure 1-3 shows the location and content of these labels on the top cover of the tape drive.

  • Page 25: Back Panel Components

    Back Panel Components Figure 1-4 shows the back panel of a single-ended tape drive. The differential tape drives look similar except that there are no SCSI terminator R-packs (resistor terminators). Figure 1-4 Back panel (single-ended configuration) Ground Tab and Grounding Hole The tape drive includes a ground tab and grounding hole to use if you want additional chassis grounding.
  • Page 26 Using the Monitor port, you can change some of the tape drive’s configuration options, download code updates, and perform diagnostic procedures on the tape drive. To use the Monitor port, you will need the Exabyte CTS Monitor program and an IBM AT port.

  • Page 27: Internal Components Of The Tape Drive

    Internal Components of the Tape Drive This section describes the internal components of the tape drive, including the tape transport mechanism, the rotating drum assembly, and each of the four main cards. Figure 1-5 shows the internal components of the EXB-8505 and EXB-8505XL.

  • Page 28: Figure 1-6 Location Of The Read Heads And Write Heads

    1 Features Tape Transport Mechanism The 8mm tape transport mechanism is manufactured by Sony to Exabyte specifications. It is compatible with 8mm data cartridges that meet the ECMA-145 standard. Rotating Drum Assembly The rotating drum assembly in the EXB-8205 and EXB-8205XL has one write head, one read head, and one servo head.
  • Page 29 The drum rotates constantly at 1831 rpm in the default format (8500c format for the EXB-8505 and EXB-8505XL; 8200c format for the EXB-8205 and EXB-8205XL). This speed of rotation results in a nominal effective head-to-tape speed of approximately 150.5 inches per second (3.8 meters per second).
  • Page 30 1 Features Preamp and Upper Analog Cards A Preamp card (SPR card) contains preamplifier, motor, and write driver circuitry. The Upper Analog card (SUA card in the EXB-8505 and EXB-8505XL; VUA card in the EXB-8205 and EXB-8205XL) contains analog filters, equalization, and clock-detect circuitry.

  • Page 31: Size And Weight

    1 Features Size and Weight Designed to meet industry-standard 5.25-inch half-high form factor mounting requirements, the tape drive is 1.62 inches high 5.75 inches wide 8.00 inches deep (41.2 146.0 203.2 mm) and weigh 2.6 pounds (1.2 kilograms). Figure 1-7 shows the external dimensions of the tape drive.

  • Page 32: Related Products

    This section describes products related to the tape drives. Integration with Other Exabyte Products You can purchase the tape drive separately or already integrated with one of the following Exabyte products: EXB-210 8mm Library Mini Tabletop Cartridge Tape Subsystem EXB-210 8mm Library...

  • Page 33: Figure 1-9 Mini Tabletop Ctss With Exb-8505S Installed

    1 Features Designed as an easily integrated data management solution, the EXB-210 provides automated data storage in a SCSI-2 environment. Operating with an EXB-8505XL and assuming a data compression ratio of 2:1, the EXB-210 can store up to 154 GBytes on eleven 160m XL data cartridges.

  • Page 34: Exatape Data Cartridges

    In addition, exclusive use of EXATAPE media with Exabyte 8mm tape drives has been shown to prolong head and tape life. Table 1-5 shows EXATAPE data cartridge compatibility with Exabyte half-high and full-high drives.

  • Page 35: Table 1-5 Exatape Media Compatibility With 8Mm Tape Drives

    Important EXB-8205XL and EXB-8505XL only. The EXB-8205 and EXB-8505 will automatically eject these data cartridges. Although Exabyte full-high 8mm tape drives will accept EXATAPE 160m XL data cartridges, they are not compatible and should not be used together. EXATAPE 160m XL data cartridges offer the same reliability and performance as all other EXATAPE data cartridges.

  • Page 36: Exabyte Cleaning Cartridges

    1 Features Exabyte Cleaning Cartridges Use an Exabyte 8mm Cleaning Cartridge to clean the tape drive. The Exabyte 8mm Cleaning Cartridge contains a shed-free fabric tape that traps and removes debris from tape drive heads and tape paths. By using this cleaning cartridge on a regular basis, you maintain data integrity and improve reliability of the tape drive.

  • Page 37: Recording Format

    Recording Format This chapter describes the recording formats used by the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. It includes information about the following: Helical-scan recording Physical format of the recorded tape Logical format of the recorded tape May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 38: Helical-Scan Recording

    2 Recording Format Helical-Scan Recording To increase the amount of data that can be recorded on the tape, the tape drive implements advanced helical-scan recording technology. Helical-scan recorders write very narrow tracks at an acute angle to the edge of the tape, as shown in Figure 2-1. This recording method creates a track length that is several times longer than the width of the tape.

  • Page 39: Physical Format

    Physical Format This section defines the physical track structure of the tape, including the types of physical track structures, physical blocks, search fields, and servo areas. Physical Track Structure The EXB-8205 and EXB-8205XL can write data to tape in two types of physical track structures: 8200 and 8200c.

  • Page 40: Figure 2-2 Relationship Of 8Mm Physical Track Structures To Logical Data Formats

    2 Recording Format Figure 2-2 Relationship of 8mm physical track structures to logical data formats EXB-8205 and EXB-8505 510504 (Standard and XL)

  • Page 41: Figure 2-3 Physical Track Structure For 8500 And 8500C Format

    8500/8500c Physical Track Structure In 8500/8500c format, an EXB-8505 or EXB-8505XL uses the W1 and W2 heads to write two partially overlapping physical tracks on the tape for each revolution of its head/drum assembly. The width of each track is 15.5 m. During a read operation, the tape drive uses the R1 and R2 heads to read the two tracks.

  • Page 42: Figure 2-4 Position Of The Tape Drive's Heads Relative To The Tracks

    2 Recording Format Figure 2-4 shows the position of the EXB-8505 and EXB-8505XL’s write (W1, W2), read (R1, R2), and servo heads, relative to the tracks as the heads pass across the tape when the tape drive is writing or reading 8500 and 8500c format tapes.

  • Page 43: Figure 2-5 Physical Track Structure For 8200C Track Format

    2 Recording Format Figure 2-5 Physical track structure for 8200c track format Figure 2-6 Physical track structure for 8200 track format May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 44: Figure 2-7 Position Of The Tape Drive's Heads Relative To The Tracks

    2 Recording Format Figure 2-7 shows the position of the tape drive’s write head, read head, and servo head relative to the tracks as the heads pass across the tape when the tape drive is reading and writing 8200c format tapes.

  • Page 45: Physical Blocks

    Physical Blocks For all three physical track formats, each physical track contains eight physical blocks. A physical block can contain user data or other information. As shown in Figure 2-8, a physical block containing user data includes the following information: 2 bytes of cyclic redundancy check (CRC) data 400 bytes of error correction code (ECC) data 1,024 bytes of uncompressed user data or 2,048 of compressed...

  • Page 46: Search Fields

    2 Recording Format Search Fields For 8500/8500c and 8200c track structures, each track contains search fields used for high-speed search. (Figure 2-8 shows where search fields are located in a track.) The search fields are the only areas of the tape that are read during a high-speed search.

  • Page 47: Recording Parameters

    Recording Parameters Table 2-1 shows the recording parameters for the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. The table includes the parameters for tape drives writing and reading data in three physical formats. Table 2-1 Recording parameters Tape drives reading and writing in this physical format: Parameter 8500/8500c Tape width...

  • Page 48: Logical Format

    2 Recording Format Logical Format The following sections describe the logical characteristics of the information recorded on the tape. The logical tape format consists of the logical beginning of tape (LBOT) mark, followed by any number of tracks up to the limit for the data cartridge. These tracks can include logical blocks of data, gap blocks and gap bytes, filemarks, setmarks, and end-of-data information.

  • Page 49: Logical Blocks

    Logical Blocks A logical block contains user data that is transferred from the host to the tape drive. Logical blocks can have fixed or variable lengths, which can be intermixed on the tape. The tape drive supports uncompressed logical block sizes from 1 to 240 KBytes. For information about setting the logical block size, refer to the EXB-8205 and EXB-8505 SCSI Reference.

  • Page 50: Figure 2-9 Logical Block Packing (One Physical Block)

    2 Recording Format In 8200 format, each physical block contains one header and one logical block. In 8200c, 8500, and 8500c formats, each physical block includes a 14-byte header that can define only two logical blocks. If the physical block contains more than two logical blocks, the tape drive adds an additional two-byte header in the data field for each logical block after the second one.

  • Page 51: Gap Bytes

    Gap Bytes A gap byte is a byte containing undefined data that the tape drive uses to fill empty space in a physical block. The tape drive may automatically write gap bytes in the following cases: At the end of a write operation. Before writing a filemark.

  • Page 52: Gap Blocks And Gap Tracks

    2 Recording Format Gap Blocks and Gap Tracks A gap block is a physical block containing 1,024 gap bytes. A gap track is a physical track containing eight gap blocks. When the tape drive stops at the end of a write operation, it writes at least one gap track following the last track containing data blocks.

  • Page 53: Filemarks

    Filemarks Filemarks enable the initiator to locate particular blocks of data on the tape quickly during a high-speed search. By using a SPACE filemark (11h) command, the initiator can position the tape to the data marked by filemarks at up to 75 times the normal tape speed (or up to 10 times the normal tape speed when reading an 8200 format tape).

  • Page 54: Setmarks (Exb-8505 And Exb-8505Xl Only)

    2 Recording Format Short Filemarks In 8500, 8500c, and 8200c formats, a short filemark consists of a single, 1-KByte physical block. This block contains information identifying the filemark’s number and location on the tape. In 8200 format, a short filemark consists of 21 tracks of information. Setmarks (EXB-8505 and EXB-8505XL only) When the EXB-8505 or EXB-8505XL is writing in 8500c format, you can issue a WRITE FILEMARKS (10h) command to write one or more...

  • Page 55: Track And Block Counts

    Track and Block Counts The number of tracks and physical blocks on the tape depend on the following markers: Physical beginning of tape (PBOT). PBOT is located at the point on the tape where the translucent leader material is attached to the media.

  • Page 56: Table 2-3 Track And Physical Block Counts For 8200 And 8200C Formats

    Table 2-3 Track and physical block counts for 8200 and 8200c formats LBOT to LEOT EXATAPE Number of tracks Size Decimal 8C44h 35,908 22FF2h 143,346 112m 46000h 286,720 160m XL 696F9h 431,865 *Track and block counts from LEOT to PEOT are approximate. Table 2-4 Track and physical block counts for 8500 and 8500c formats LBOT to LEOT EXATAPE...

  • Page 57: Functional Description

    Functional Description This chapter describes the functional features of the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL, including write and read operations. May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 58: Write Operations

    3 Functional Description Write Operations Figure 3-1 provides a high-level overview of the tape drive’s flow of data during a write operation. Data not to be compressed SCSI Data to be compressed Compression Figure 3-1 Data flow during a write operation Data Flow and Data Compression The data-flow process during a write operation is outlined below.
  • Page 59 If data compression is turned on, the data goes from the SCSI bus to the compression integrated circuit where it is compressed and then decompressed. The tape drive performs a Compression Integrity Check™ by comparing the decompressed data to the original data.

  • Page 60: Streaming And Start/Stop Modes

    3 Functional Description Data Compression Monitoring The tape drive constantly monitors the compression ratio to determine whether compressing the data will actually decrease the size of the data set. When a logical block expands (as it might, for example, when it has already been compressed by the initiator), the tape drive automatically switches to uncompressed format.

  • Page 61: Thresholds During A Write Operation

    Thresholds During a Write Operation In start/stop mode, the motion threshold controls the starting and stopping of tape motion. In streaming mode, the reconnect threshold controls the rate of disconnects and reconnects between the tape drive and the initiator. The values of both of these thresholds can be changed with a MODE SELECT command.

  • Page 62: Read-After-Write Checking

    3 Functional Description Error Detection, Correction, and Recovery Procedures As the tape drive writes data to tape, it integrates error correction code (ECC) and physical-block cyclic redundancy check (CRC) bytes with each physical block. After it writes data, the tape drive uses the ECC and CRC to perform a read-after-write check to ensure data reliability.

  • Page 63: Read Operations

    Read Operations Figure 3-2 provides a high-level overview of the tape drive’s flow of data during a read operation. Uncompressed data SCSI Decompression circuit Figure 3-2 Data flow during a read operation The process for reading logical blocks of user data is outlined below. The tape drive reads data from tape, uses ECC to correct errors as necessary for each physical block, and transfers data to the data buffer.

  • Page 64: Thresholds During A Read Operation

    3 Functional Description Thresholds During a Read Operation The motion threshold controls the starting and stopping of tape motion. The reconnect threshold controls the rate of disconnects and reconnects between the tape drive and the initiator. Motion Threshold In a start/stop read operation, the tape-to-buffer transfer speed is faster than the buffer-to-initiator transfer speed.

  • Page 65: Requirements For Use

    Requirements for Use This chapter specifies the requirements for installing, operating, maintaining, and shipping the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. This chapter includes the following sections: Installation requirements Operation Preventive maintenance Loading new microcode Shipping requirements May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 66: Installation Requirements

    4 Requirements for Use Installation Requirements Installing the tape drive involves the following steps: Setting the SCSI ID Mounting the tape drive in a mounting frame (if desired) Terminating the tape drive (if necessary) Connecting a SCSI cable to the tape drive Connecting the tape drive to the power supply This section describes the requirements for installing the tape drive.

  • Page 67: Requirements For Mounting The Tape Drive

    Note that changes in the SCSI ID setting will not take effect until one of the following conditions occur: Normal power-on The tape drive is reset by a SCSI bus reset The tape drive receives a Bus Device Reset message For detailed instructions for setting the SCSI ID, including the pin assignments for the SCSI ID jumper block, refer to EXB-8205 and EXB-8505 Installation and Operation.

  • Page 68: Figure 4-2 Mounting Holes On The Sides

    4 Requirements for Use Figure 4-2 Mounting holes on the sides Figure 4-3 Mounting holes on the bottom EXB-8205 and EXB-8505 510504 (Standard and XL)

  • Page 69: Figure 4-4 Mounting Hole Dimensions In Inches (And Millimeters)

    4 Requirements for Use The mounting holes accommodate M3 0.5 6 mm screws and are designed for standard 5.25-inch half-high form factor mounting requirements. The holes are 0.31 inches (7.9 mm) deep. Figure 4-4 shows the dimensions for the tape drive’s mounting holes. Figure 4-4 Mounting hole dimensions in inches (and millimeters) May 1994 EXB-8205 and EXB-8505...

  • Page 70: Requirements For Scsi Bus Termination

    SCSI bus or if external termination is used. If necessary, the single-ended tape drive can be terminated externally. To ensure that the tape drive performs to specification, Exabyte recommends a Methode Electronics, Inc. dataMate single-ended external terminator.

  • Page 71: Requirements For Connecting A Scsi Cable

    A characteristic impedance greater than 90 ohms is recommended for shielded cables. Important Exabyte recommends that cables used on the same bus have the same impedances. Cable Length The maximum length of the SCSI cable depends on whether you are...

  • Page 72: Figure 4-5 Scsi Connector Location On The Back Panel

    4 Requirements for Use Primary Conductor A minimum primary conductor size of 28 AWG is recommended to minimize noise effects and ensure proper distribution of terminator power. SCSI Cable Connector Requirements The SCSI connector is located at the back of the tape drive, as shown in Figure 4-5.

  • Page 73: Table 4-1 Connector Pin Assignments For Differential Tape Drives

    Table 4-1 Connector pin assignments for differential tape drives Signal SHIELD GROUND +DB(0) +DB(1) +DB(2) +DB(3) +DB(4) +DB(5) +DB(6) +DB(7) +DB(P) DIFFSENS GROUND TERMPWR GROUND +ATN GROUND +BSY +ACK +RST +MSG +SEL +C/D +REQ +I/O GROUND May 1994 Pin Number EXB-8205 and EXB-8505 (Standard and XL) 4 Requirements for Use...

  • Page 74: Table 4-2 Connector Pin Assignments For Single-Ended Tape Drives

    4 Requirements for Use Table 4-2 Connector pin assignments for single-ended tape drives Signal +DB(0) +DB(1) +DB(2) +DB(3) +DB(4) +DB(5) +DB(6) +DB(7) +DB(P) GROUND GROUND GROUND TERMPWR GROUND GROUND –ATN GROUND –BSY –ACK –RST –MSG –SEL –C/D –REQ –I/O * All odd pins except pin 25 are connected to ground. Pin 25 is left open. 4-10 Pin Number* EXB-8205 and EXB-8505...

  • Page 75: Operation

    Operation This section provides general information about operating the tape drive. For more detailed instructions, refer to EXB-8205 and EXB-8505 Installation and Operation. Power-On Mode In its normal power-on mode, the tape drive completes a power-on self-test in approximately 30 seconds. Once the power-on self test is complete, the tape drive loads the tape (if already inserted), and positions the tape at LBOT.

  • Page 76: Figure 4-6 Leds On The Faceplate Of The Exb-8505 And Exb-8505Xl

    4 Requirements for Use Figure 4-6 LEDs on the faceplate of the EXB-8505 and EXB-8505XL Figure 4-7 LEDs on the faceplate of the EXB-8205 and EXB-8205XL 4-12 EXB-8205 and EXB-8505 510504 (Standard and XL)

  • Page 77: Table 4-3 Led States During Operation

    Different LED combinations indicate the tape drive’s operating state, as follows: When the top (amber) LED is on or flashing, the tape drive either has an error or needs to be cleaned. When the middle LED is on or flashing, SCSI bus activity is occurring.

  • Page 78: Loading Data Cartridges

    If you attempt to load a cartridge during a power-on self-test, the tape drive will eject the cartridge. If you attempt to load a 160m data cartridge that is not equipped with an Exabyte Recognition System stripe into an EXB-8205XL or EXB-8505XL, the tape drive will eject the cartridge.

  • Page 79: Unloading Data Cartridges

    Refer to EXB-8205 and EXB-8505 Installation and Operation for instructions for setting the write-protect switch and loading data cartridges in the tape drive. Refer to the EXB-8205 and EXB-8505 SCSI Reference for information about the MODE SELECT and LOAD commands. Load Time The time required to load the data cartridge and position the tape to LBOT after the data cartridge is inserted is approximately 60 seconds.

  • Page 80: Error During Unload Procedure

    4 Requirements for Use Effect of PREVENT/ALLOW MEDIUM REMOVAL Command If an initiator has issued a PREVENT MEDIUM REMOVAL (1Eh) command to prevent the removal of the data cartridge, the tape drive will not eject the data cartridge until the initiator sends an ALLOW MEDIUM REMOVAL (1Eh) command to allow you to remove the data cartridge.

  • Page 81: Using Scsi Commands

    Preventive Maintenance Except for cleaning, the tape drive has no user serviceable adjustments or maintenance procedures. All service or repairs to the tape drive must be performed by Exabyte Corporation or authorized service personnel. Cleaning the Tape Drive The tape drive’s tape heads and tape path should be cleaned on a regular basis.

  • Page 82: Determining When The Tape Drive Needs Cleaning

    REQUEST SENSE command is received. Loading New Microcode To upgrade the microcode in the tape drive, you can: Use a microcode update tape that you obtain from Exabyte (no special software required) Create a microcode update tape from another tape drive using the...

  • Page 83: Shipping Requirements

    Use the READ BUFFER command to copy the new code from a tape drive across the SCSI bus to an initiator. You can then use the WRITE BUFFER command to copy the code from the initiator to another tape drive. For more information about the CTS Monitor program, refer to the CTS Monitor documentation.

  • Page 84: Unpacking And Packing Instructions

    (CFCs) or heavy metals. Unpacking and Packing Instructions Unpacking and packing instructions for the tape drive are included in EXB-8205 and EXB-8505 8mm Cartridge Tape Subsystem Installation and Operation. To avoid damaging the tape drive, use the original shipping carton and packing materials (or replacement packaging obtained from the vendor) when repacking and shipping the tape drives.

  • Page 85: Interface Specifications

    Interface Specifications This chapter describes the tape drive’s SCSI interface, including the following sections: SCSI features Physical path SCSI messages SCSI commands Using SCSI commands May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 86: Scsi Features

    5 Interface Specifications SCSI Features Implementation characteristics of the Small Computer System Interface (SCSI) controller include the following: Support for single-ended or differential SCSI configurations. SCSI bus parity checking configurable through the MODE SELECT command. Support for multiple initiator configurations. Support of the disconnect, reconnect, and arbitration feature, which releases the tape drive from the bus so that it can operate under its own internal intelligence system, enabling the SCSI bus...

  • Page 87: Scsi Messages

    SCSI Messages The SCSI message system supported by the tape drive allows communication between the initiator and the tape drive for physical path management. Table 5-1 lists the SCSI messages supported by the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. Refer to the EXB-8205 and EXB-8505 SCSI Reference for detailed information about SCSI communications and messages.

  • Page 88: Scsi Commands

    5 Interface Specifications SCSI Commands The SCSI-2 command set supported by the tape drive consists of 19 six-byte commands (Group 0 command set) and 6 ten-byte commands (Group 1 command set). These commands are listed in Table 5-2. Note: Tapes written and read in 8200 format use the SCSI-1 command set.
  • Page 89 Command OP Code READ BUFFER READ POSITION RECEIVE DIAGNOSTIC RESULTS RELEASE UNIT REQUEST SENSE RESERVE UNIT REWIND SEND DIAGNOSTICS SPACE TEST UNIT READY VERIFY WRITE WRITE BUFFER WRITE FILEMARKS May 1994 Description Copies the tape drive’s microcode across the SCSI bus to the initiator.

  • Page 90: Using Scsi Commands

    5 Interface Specifications Using SCSI Commands This section describes the SCSI commands used to write, read, erase, and search for data, and to copy microcode, inquire about tape drive status, set operating parameters, and perform diagnostic tests. Writing Data To transfer bytes or blocks of data from the initiator to the tape drive, use the WRITE (0Ah) command.

  • Page 91: Searching For Data

    Searching for Data To enable the tape drive to perform forward or backward searches, use the SPACE (11h) or LOCATE (2Bh) commands. The tape drive moves the tape at its high-speed search speed, which is up to 75 times the nominal tape speed. The tape drive can space over both fixed and variable blocks.

  • Page 92: Performing Diagnostic Tests

    5 Interface Specifications Fault Symptom Code (FSC) that indicates the specific nature of hardware and software errors or other events (the FSC is an Exabyte-unique byte) INQUIRY (12h) Command You can use the INQUIRY (12h) command to obtain information about the tape drive’s firmware level, the version of SCSI supported by the tape drive, and so on.

  • Page 93: Functional Specifications

    Functional Specifications This chapter includes functional specifications for the tape drive, including the following sections: Performance specifications Reliability specifications Power specifications Environmental specifications May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 94: Performance Specifications

    6 Functional Specifications Performance Specifications This section describes the performance specifications for the tape drive. Write and Read Access Times Write access time starts when the tape drive receives the last byte of the WRITE command (that is, when the initiator de-asserts ACK) and ends when the tape drive asserts REQ to request that the initiator transfer the first data byte across the SCSI bus.

  • Page 95: Tape Speed

    Tape Speed Table 6-2 lists the nominal tape speed at which data can be written and read by the tape drives. Table 6-2 Nominal tape speed Format 8500c 8500 8200c 8200 File-Search Tape Speed Table 6-3 lists forward and backward file-search tape speeds for the tape drives.

  • Page 96: Reposition Time

    Table 6-4 Typical rewind times Size of EXATAPE 160m XL EXATAPE data cartridges are recommended for use with all Exabyte products and are available for purchase from Exabyte Corporation. 160m XL media is intended for use in the EXB-8205XL and EXB-8505XL only. Reposition Time Reposition time starts when the initiator issues a command that stops the tape drive’s motion control system and ends when the tape is...

  • Page 97: Drum Rotation Period

    Drum Rotation Period Table 6-5 shows the drum rotation period for the tape drives reading and writing tapes in all formats. Table 6-5 Drum rotation periods Format 8500c* 8500* 8200c 8200 *EXB-8505 and EXB-8505XL only Tape Tension Release and Drum Motion Suspension The tape drive releases tape tension under either of the following conditions: The tape is at LBOT and the tape drive has not received a...

  • Page 98: Data Transfer Rate

    6 Functional Specifications Data Transfer Rate The maximum obtainable data transfer rates for the tape drive depend on what mode it is operating in. Table 6-6 shows the data transfer rates for each of the four formats. Table 6-6 Data transfer rates Type of transfer 8500c...

  • Page 99: Reliability Specifications

    Reliability Specifications This section lists the reliability specifications for the tape drive. Service Life The tape drive has been designed to exceed a useful service life of five years, during which time all performance and reliability specifications are applicable. Machine Reliability: Mean Time Between Failures (MTBF) The mean time between failures (MTBF) value for the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL is 160,000 power-on hours.

  • Page 100: Test Conditions

    Environmental conditions for the tape drive and the 8mm data cartridges must be maintained as specified in the “Environmental Specifications” section of this chapter. The tape drive must be cleaned with an Exabyte or an Exabyte-approved cleaning cartridge using the recommended cleaning procedure. Refer to EXB-8205 and EXB-8505 Installation and Operation for instructions.

  • Page 101: Data Integrity

    Restrictions for the MTBF Value The following types of failures are excluded from the calculation of MTBF: Failures arising from incorrect operating procedures Cable failures, power supply failures, or other failures not caused by equipment Failures caused by incorrect grounding procedures or by interference from external sources Media failures, or any failures or degraded performance caused by use of faulty or damaged media...

  • Page 102: Data Reliability

    Environmental conditions for the tape drive and the 8mm data cartridges must be maintained as specified in the “Environmental Specifications” section of this chapter. The tape drive must be cleaned with an Exabyte or Exabyte-approved 8mm cleaning cartridge using the recommended cleaning procedure. Refer to EXB-8205 and EXB-8505 Installation and Operation for instructions.

  • Page 103: Write Reliability

    Write Reliability Write reliability is determined by the rate of permanent write errors. During a write operation, the tape drive uses read-after-write checking to determine whether physical data blocks are correctly written to tape. When the read-after-write check criteria are not met for a data block, the tape drive rewrites the block.

  • Page 104: Power Specifications

    6 Functional Specifications Power Specifications This section lists the power specifications for the tape drive. Voltages The tape drive operates from standard +5 VDC and +12 VDC supply voltages, as specified in Table 6-7. All specified voltages are DC; no external AC power is used by the tape drive.

  • Page 105: Power Connector

    Power Connector The power connector used in the tape drive is compatible with the power connector used for standard 5.25-inch, half-high devices. Figure 6-1 shows the location of the power connector on the rear of the tape drive and the pin assignments. Figure 6-1 Power connector location on the back panel Table 6-8 lists the pin assignments for the power connector.

  • Page 106: Grounding Hole And Ground Tab

    6 Functional Specifications Grounding Hole and Ground Tab The rear panel of the EXB-8205 and EXB-8505 includes a grounding hole and a ground tab, as shown in Figure 6-2. These can be used to provide additional chassis grounding if desired. The grounding hole uses an M3 0.5 6mm self-tapping screw, while the ground tab uses -inch female spade connector.

  • Page 107: Environmental Specifications

    Environmental Specifications This chapter describes the following environmental specifications for the tape drive: Operating environment Air flow requirements Particulate contamination limits Shock and vibration specifications Acoustic noise limits Table 6-9 shows the overall environmental specifications for the tape drive. Table 6-9 Environmental specifications Specification Operation Temperature...

  • Page 108: Operating Environment

    6 Functional Specifications Operating Environment The psychrometric chart, Figure 6-3, shows the operating temperature and humidity ranges for the tape drive. The dotted line represents the operating environment. Table 6-10 defines the temperature and humidity points shown in Figure 6-3. Table 6-10 Temperature and humidity specifications Point Figure 6-3 Temperature and humidity ranges for operation...

  • Page 109: Air Flow Requirements

    Air Flow Requirements Adequate air flow must be provided in the enclosure for the tape drive to dissipate heat resulting from approximately 15.0 watts of power consumption. The air flow around the entire tape drive must be sufficient to prevent the tape path temperature from exceeding 40 C (104 F).

  • Page 110: Shock Specifications

    6 Functional Specifications Figure 6-4 Particulate contamination specification vs. typical office Shock Specifications Table 6-12 lists the shock specifications for the tape drive. The operating shock levels indicate how much shock the tape drive can withstand while it is reading and writing data. The non-operating and storage shock levels indicate how much shock the tape drive can withstand when it is not operating.

  • Page 111: Vibration Specifications

    Vibration Specifications Table 6-13 lists the vibration specifications for the tape drive during operation, non-operation, storage, and transportation. The operating specifications listed in this table indicate the amount of vibration that the tape drive can withstand while reading and writing data. Table 6-13 Vibration specifications Random vibration 1 Hz...

  • Page 112: Acoustic Noise

    6 Functional Specifications Acoustic Noise The overall, averaged A-weighted sound power levels (decibels) for the tape drive do not exceed the upper limits specified in Table 6-14. Table 6-14 Acoustic noise limits The tape drive is powered on and idle. The tape drive is fully operational and operating in streaming mode for a read or write operation.

  • Page 113: Safety And Regulatory Agency Compliance

    Safety and Regulatory Agency Compliance This chapter describes the following: Safety agency standards Electrostatic discharge (ESD) standards Electromagnetic compatibility (EMC) Radiated susceptibility May 1994 EXB-8205 and EXB-8505 (Standard and XL)

  • Page 114: Safety Agency Standards

    7 Safety and Regulatory Agency Compliance Safety Agency Standards When purchased from Exabyte Corporation, the tape drive is certified as a component by the following domestic and international product safety standards. UL Standard 1950, 1st Edition, Information Technology Equipment CAN/CSA Standard C22.2 No. 950-M89, Safety of Information...

  • Page 115: Electromagnetic Compatibility (Emc)

    Electromagnetic Compatibility (EMC) When properly installed with a shielded cabinet, shielded cable and adequate grounding of the SCSI bus and the input power, the tape drive meets the requirements for radiated and conducted emissions as defined by the following standards: FCC Rules, Part 15, Class B Computing Devices Canadian Department of Communications, Radio Interference Regulation for Digital Apparatus, Class B...
  • Page 116 7 Safety and Regulatory Agency Compliance Notes: EXB-8205 and EXB-8505 510504 (Standard and XL)

  • Page 117: Glossary

    Glossary 8200 format 8200c format 8500 format 8500c format bus devices Canadian DOC connect May 1994 One of the data formats written and read by the EXB-8205, EXB-8205XL, EXB-8505, and EXB-8505XL. Tapes written in 8200 format can also be read by any EXB-8200, EXB-8200SX, EXB-8500, or EXB-8500c.
  • Page 118 Glossary disconnect ECMA EEPROM EPROM EXATAPE EXB-8200 EXB-8200SX EXB-8205 EXB-8205XL EXB-8500 EXB-8500c The termination of communications between the initiator and the target. During a disconnect, the target releases control of the SCSI bus, allowing the bus to become free. Error correction code. European Computer Manufacturers Association.
  • Page 119 LEOT MByte MLCH May 1994 The EXB-8505 8mm Cartridge Tape Subsystem. The EXB-8505 is a half-high 8mm cartridge tape subsystem that can store 10 gigabytes of data on a single EXATAPE 112m 8mm data cartridge, assuming an average 2:1 compression ratio.
  • Page 120 Glossary ms or msec NSTA PBOT PEOT POST ready reconnect SCSI address signal assertion signal de-assertion signal release status target s or sec Millimeter (0.03937 inches). Millisecond. Nanosecond. National Safe Transit Association. Physical beginning of tape. Physical end of tape. Power-on self-test;...

  • Page 121: Index

    Index acoustic noise specifications 6-20 agency standards 7-1 – 7-4 air flow requirements 6-17 back panel components 1-11 bit error rate read errors 6-11 write errors 6-11 blocks gap 2-16 logical 2-13 physical 2-9 cards 1-15 – 1-16 cleaning cartridge 4-17 cleaning requirements 4-17 cleaning the tape drive LED indicators for 4-13...
  • Page 122 Index filemarks long filemarks 2-17 short filemarks 2-18 formats, data description 1-5 front bezel 1-9 gap blocks 2-16 gap bytes 2-15 gap tracks 2-16 ground 6-14 ground tab and hole 1-11, 6-14 heads description 1-14 position of relative to tracks 2-8 heat dissipation requirements 6-17 helical scan recording 2-2 high-speed search 6-3...
  • Page 123 read access time 6-2 read operations 3-7 read reliability 6-11 read-after-write checking 3-6 reconnect threshold during a read operation 3-8 during a write operation 3-5 recording format 2-1 – 2-20 recording parameters 2-11 reliability specifications 6-7 reposition time 6-4 reselection timeout 6-6 reset conditions 4-16 rewind tape speed 6-4 safety agency standards 7-2...
  • Page 124 Index Notes: EXB-8205 and EXB-8505 510504 (Standard and XL)

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