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STT20000N, STT20000N-C
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SCSI Minicartridge Drives
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(standard and NS-20 versions)
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Product Manual
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Table of Contents
Related Manuals for Seagate STT20000N
Summary of Contents for Seagate STT20000N
- Page 1 ....... STT20000N, STT20000N-C .......
- Page 2 © 1998 Seagate Technology, Inc. All rights reserved No part of this publication may be reproduced in any form without written permission from Seagate Technology, Inc. Publication Number 10005135-001, March 1998 Seagate, Seagate Technology, the Seagate logo and Sidewinder are trademarks or registered trademarks of Seagate Technology, Inc.
- Page 3 Caution. Changes or modifications made to this equipment which have not been expressly approved by Seagate Technology may cause radio and television interference problems that could void the user's authority to operate the equipment. Further, this equipment complies with the limits for a Class B digital apparatus in accordance with Canadian Radio Interference Regulations.
- Page 4 Seagate Technology. Seagate Technology provides this manual "as is," without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
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Page 5: Table Of Contents
SCSI device address jumpers..............19 Parity ....................... 19 SCSI terminator enable ................19 Terminator power ..................20 Installing the drive....................21 Mounting dimensions .................... 22 Cabling and connectors ..................23 Electrical characteristics ................24 Single-ended SCSI connector................. 25 STT20000N Product Manual Page v... - Page 6 Using Travan cartridges ..................28 Loading and unloading tape cartridges............28 Setting the write–protect switch ..............29 Loading revised firmware from a Seagate firmware cartridge ........ 29 Drive maintenance ....................30 Caring for tape cartridges ................30 Cleaning the drive read/write head..............31 Troubleshooting ....................
- Page 7 Flash EEPROM ....................54 Sensors and switches ................... 54 Media (Travan minicartridges)................55 Read-While-Write ....................56 ALDC data compression ..................56 Glossary Acronyms and units of measurement Acronyms and abbreviations ................. 60 Units of measurement................... 62 STT20000N Product Manual Page vii...
- Page 8 Table of Contents Notes Page viii STT20000A Product Manual...
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Page 9: Introduction
(assumes 2:1 compression ratio). An additional feature of the STT20000 SCSI minicartridge drive is an option for Read While Write and Hardware data Compression. These features are available on the NS series (STT20000N-C). Highlights of these features are contained in various parts of this Product Description Manual. - Page 10 Travan TR-5 media. The drive offers electronically erasable, programmable, read-only memory (flash EEPROM), which enables qualified Seagate OEMs to download revised firmware to the drive. With the availability of greater capacity disk drives and the growth of small networks, the need for cost-effective, high-capacity SCSI-storage has grown.
- Page 11 Introduction Chapter 1 Figure 1-1 STT20000 SCSI minicartridge internal drive (3.5-inch mounting configuration) Figure 1-2 STT20000 SCSI minicartridge internal drive with mounting brackets (5.25-inch mounting configuration) STT20000N Product Manual Page 3...
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Page 12: Features
Software selectable synchronous or asynchronous SCSI data transfer • High performance SCSI burst transfer rate of 5 Mbyte/sec with 512 Kbyte (2 Mbyte on the STT20000N-C NS-20 drive) on-drive data buffer to facilitate the most efficient use of the host computer and tape drive •... -
Page 13: Typical System Configurations
This serpentine process continues until the entire tape is recorded. The individual tracks are sequential to minimize the amount of head motion as the heads change position for each track. STT20000N Product Manual Page 5... -
Page 14: Flash Eeprom
5.0 or later, Microsoft Windows 3.1 or later, Microsoft Windows 95, or Windows NT. The drive operates with many of the popular backup software applications such as Seagate 's Backup Exec for DOS and Windows, Windows 95, Netware, or Windows NT. References The following standards documents describe some of the technology incorporated in the drives referenced in this manual. -
Page 15: About This Manual
SCSI information on the SCSI commands themselves. Refer to the SCSI Minicartridge Drive SCSI Manua l (P/N 10001652-002) for detailed information about the SCSI interface, including a complete command summary. STT20000N Product Manual Page 7... - Page 16 Chapter 1 Introduction Notes Page 8 STT20000A Product Manual...
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Page 17: Specifications
6.36 in/161.5 mm 1.0 lbs/0.5 kg 1.5 lbs/0.7 kg Weight Figures 2-1 and 2-2 show the general dimensions of the STT20000A in 3.5-inch configuration (without mounting brackets) and in the 5.25-inch configuration (with mounting brackets). STT20000N Product Manual Page 9... - Page 18 Chapter 2 Specifications Figure 2-1 STT20000N (3.5-Inch mount)—general dimensions 4.00 in (101.6 mm) 6.36 in (161.5 mm) 0.157 in (4 mm) 4.00 in (101.6 mm) 1.00 in (25.4 mm) Figure 2-2 STT20000N (5.25-Inch mount)—general dimensions 0.86" (21.8mm) 5.49" (139.4mm) 5.76" (146.4mm) 0.20"...
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Page 19: Power Specifications
Power use < 15 Watts < 15 Watts (nominal) (excluding surge) (excluding surge) The following table lists pin assignments for the power connector for the drive. Assignment +12 VDC +12 return +5 return +5 VDC STT20000N Product Manual Page 11... -
Page 20: Drive Performance Specifications
Chapter 2 Specifications Drive performance specifications The following table lists the performance specifications for the STT20000 SCSI minicartridge drive. Feature Specification 10.0 gigabytes—1650 Oe 740' Travan cartridge Capacity (uncompressed) 20.0 gigabytes—1650 Oe 740' Travan cartridge (compressed) Effective backup rate up to 60 Mbyte/min typical native; up to 120 Mbyte/min typical compressed 489 / 733 / 1,000 Kbyte/second FastSense Data transfer rate... -
Page 21: Environmental Requirements
(A-wt sum) enclosure at 3-ft distance and operator height) Shock (1/2 sine wave) 2.5 g’s peak, 11 msec 100 g's peak, 11 msec Specification applies to drive mechanism and media Specification applies to drive mechanism only STT20000N Product Manual Page 13... -
Page 22: Reliability
12% the STT20000 MTBF can equal 250,000 hours. Note: Seagate does not warrant the stated MTBF as representative of any particular unit installed for customer use. The failure rate quoted here is derived from a large database of test samples. Actual rates may vary from unit to unit. -
Page 23: Recommended Tapes
• Provide the correct voltages (+5 VDC and +12 VDC) based on the regulation applied—Extra Low Voltage (SEC) for UL and CSA and Safety Extra Low Voltage for BSI and VDE (if applicable). STT20000N Product Manual Page 15... - Page 24 Chapter 2 Specifications Notes Page 16 STT20000A Product Manual...
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Page 25: Installation
Lay the drive only on top of the anti-static bag or return it to its bag when you need to lay the drive down. Installation overview The drive mounts internal to the computer in either a 3.5-inch by one-inch space or in a 5.25-inch half-high space with the use of mounting brackets. STT20000N Product Manual Page 17... -
Page 26: Setting Jumpers
Chapter 3 Installation Three simple steps make up the installation procedure: Configure jumpers. Mount the drive unit. Complete the power and interface connections. The installation procedure is the same for both models except physically mounting the unit in the computer. After you configure the jumpers and decide whether or not you need to add terminators, follow the steps provided for the size of enclosure into which you are mounting the drive. -
Page 27: Scsi Device Address Jumpers
To enable parity, place a jumper shunt over the two pins—7 and 8—as shown in Figure 3-2. Be sure the jumper shunt is firmly in place. SCSI terminator enable The last device on the SCSI bus must have termination. Figure 3-3 illustrates the termination for two daisy-chain configurations. STT20000N Product Manual Page 19... -
Page 28: Terminator Power
Chapter 3 Installation Figure 3-3 Daisy-chain configurations SCSI Host Adapter (terminated) SCSI Tape drive other SCSI device (not terminated) (terminated) SCSI Host Adapter (terminated) other SCSI device SCSI Tape drive (not terminated) (terminated) The STT20000 SCSI minicartridge drive supports active termination and does not require the use of terminating resistor packs. -
Page 29: Installing The Drive
Cabling and Connectors ) with the SCSI connector on the rear of the unit. When you make the connection, be sure pin 1 of the connector aligns with pin 1 on the SCSI connector. STT20000N Product Manual Page 21... -
Page 30: Mounting Dimensions
Chapter 3 Installation Note: Pin 1 on the SCSI connector is to your right as you look at the back of the drive. (See Figure 3-1.) Your SCSI cable should have Pin 1 highlighted by a color strip. Be sure to mate Pin 1 on the cable to Pin 1 on the drive. Failure to do so could make the drive inoperative. -
Page 31: Cabling And Connectors
(19 feet) may be used to connect the drive to its SCSI host adapter output. If twisted-pair cabling is used, connect the twisted pairs to physically opposing contacts on the connector. A stub length no greater than 0.1 meter should be used off the mainline connection within any connected equipment. STT20000N Product Manual Page 23... -
Page 32: Electrical Characteristics
Chapter 3 Installation The cable characteristic impedance should not be less than 90 ohms nor greater than 140 ohms. A cable characteristic impedance of greater than 100 ohms is recommended. To minimize noise and ensure even distribution of terminator power, the minimum recommended conductor size is 28 AWG (0.08042 mm Electrical characteristics This section lists measurements of various electrical signals in relation to the single-... -
Page 33: Single-Ended Scsi Connector
25 is left open. A signal name or abbreviation preceded by a –(dash) indicates that the signal is active-low. Assignment –DB(0) –DB(1) –DB(2) –DB(3) –DB(4) –DB(5) –DB(6) –DB(7) –DB(P) GROUND GROUND GROUND TERMINATOR POWER GROUND GROUND –ATN GROUND –BSY –ACK – STT20000N Product Manual Page 25... - Page 34 Chapter 3 Installation Assignment –MSG –SEL –C/D –REQ –I/O The +5V drive supply is available on the SCSI connector as a terminator power option. This pin is connected to the +5V through a diode. The option is a hardware jumper on the rear PCB of internal drives with terminator power disabled as a factory default.
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Page 35: Drive Operation And Maintenance
(LED). This LED is lit when the tape is NOT at the beginning of the tape. Thus, the LED shows tape movement when lit. Figure 4-1 shows the front panel of the internal drive. Figure 4-1 Front panel of 3.5-inch internal drive DRIVE ACTIVE (AMBER) STT20000N Product Manual Page 27... -
Page 36: Using Travan Cartridges
Chapter 4 Drive operation and maintenance Using Travan cartridges The minicartridges recommended for use with the STT20000 SCSI minicartridge drive are listed in Chapter 2. This section describes some operations using the cartridges. Loading and unloading tape cartridges Your tape drive has a flip-up door that covers the cartridge opening when a tape cartridge is not installed in the drive. -
Page 37: Setting The Write-Protect Switch
To return a cartridge to the "writeable" state, push the switch toward the end of the cartridge or to the unlocked position.. Loading revised firmware from a Seagate firmware cartridge The STT20000 SCSI minicartridge drive uses flash EEPROM. Flash EEPROM enables you to download new firmware when revisions to firmware are released. -
Page 38: Drive Maintenance
If after a repeat loading of the firmware cartridge, the same condition is observed, contact your Seagate sales representative. Firmware upgrade cartridges are available to qualified Seagate OEM customers. Contact your Seagate sales representative for information. Drive maintenance Minimal maintenance is needed to ensure that your STT20000 SCSI minicartridge drive operates at peak condition. -
Page 39: Cleaning The Drive Read/Write Head
For new cartridges, clean the head after two hours of tape movement. Thereafter the drive can be cleaned as per normal operations. You can clean the drive head by one of two methods: you can use the Seagate approved 3M DC2000 cleaning cartridge DC051111 (12947), P/N CKDC2000, which is available through Seagate Express 1-800-531-0968, or you can manually clean the drive head. -
Page 40: Troubleshooting
Check all cable connections for proper contact. Clean the tape drive head as previously instructed. Then try the operation again. If problems persist, contact your tape drive supplier or Seagate technical support at US and Canada 1-800-SEAGATE (1-800-732-4283) Outside US and Canada... -
Page 41: Scsi Interface
The SCSI-1 interface for the drive complies with the ANSI Standard X3.131-1986. The following tables list the Status Codes, Message Codes, and Commands, respectively, for this interface. SCSI-1 status codes 4-bit Status Code Bits Definition Good Status Check Condition Busy Intermediate Status Reservation Conflict STT20000N Product Manual Page 33... -
Page 42: Scsi-1 Message Codes
Chapter 5 SCSI Interface SCSI-1 message codes Direction * Code Description Command Complete Save Data Pointer Disconnect Initiator Detected Error Abort Message Reject In/Out No Operation Message Parity Error Linked Command Complete Linked Command Complete with Flag Bus Device Reset Identify (When sent by host, disables In/Out Disconnect/Reconnect) -
Page 43: Scsi-1 Commands
SEND DIAGNOSTIC PREVENT/ALLOW MEDIUM REMOVAL WRITE DATA BUFFER READ DATA BUFFER CHANGE DEFINITION M = Mandatory Command O = Optional Command E = Extended Command V = Vendor * = Defined in SCSI-2 Unique Command STT20000N Product Manual Page 35... -
Page 44: Ansi X3.131 Conformance Statement (Scsi-1)
Chapter 5 SCSI Interface ANSI X3.131 CONFORMANCE STATEMENT (SCSI-1) General features • Supports arbitration • Disconnect/reconnect. • Single-ended drivers. • Termination power supplied to cable (jumper option). • Supports both single and multi-initiator systems. • Fixed and variable block transfer lengths. •... -
Page 45: Messages
The SCSI-2 interface for the SCSI Minicartridge drive conforms with the ANSI X3.T92 standard. The following three tables list the status codes, message codes, and commands for this interface. SCSI-2 status codes 4-bit Status Code Bits Definition Good Status Check Condition Busy Intermediate Status Reservation Conflict STT20000N Product Manual Page 37... -
Page 46: Scsi-2 Message Codes
Chapter 5 SCSI Interface SCSI-2 message codes Direction * Code Description Command Complete Save Data Pointer Disconnect Initiator Detected Error Abort Message Reject In/Out No Operation Message Parity Error Linked Command Complete Linked Command Complete with Flag Bus Device Reset Identify (When sent by host, disables In/Out Disconnect/Reconnect) - Page 47 INQUIRY VERIFY MODE SELECT RESERVE UNIT RELEASE UNIT ERASE MODE SENSE LOAD/UNLOAD RECEIVE DIAGNOSTIC RESULTS SEND DIAGNOSTIC PREVENT/ALLOW MEDIUM REMOVAL LOCATE READ POSITION WRITE DATA BUFFER READ DATA BUFFER CHANGE DEFINITION LOG SELECT LOG SENSE STT20000N Product Manual Page 39...
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Page 48: Ansi X3.T92 Conformance Statement (Scsi-2)
Chapter 5 SCSI Interface M = Mandatory Command O = Optional Command V = Vendor Unique Command ANSI X3.T92 conformance statement (SCSI-2) SCSI-2 general features • Disconnect/reconnect, arbitration (required in SCSI-2). • Single-ended drivers. • Termination power supplied to cable (jumper option). •... -
Page 49: Scsi-2 Messages
Linked Command Complete with flag Message Reject Initiator Detected Error Identify Synchronous Data Transfer Request Abort Message Parity Error Bus Device Reset Command Complete No Operation SCSI-2 vendor-unique commands • Seek Block • Partition • Request Block Address STT20000N Product Manual Page 41... -
Page 50: Command Set Changes To Incorporate Rww And Hdc
Read-While-Write Log Sense Write Error Counts page code (02h) Log Sense page code 02h (Write Error Counts) has been added to the Seagate tape drives that have read while write (RWW) capabilities. A Seagate tape drive that supports read while write can be detected by requesting the available Log Sense pages (Log Sense page code 0), then noting support for Log Sense page 2 (Write Error Counts). -
Page 51: Hardware Data Compression
Mode Select / Mode Sense Data Compression page code (0Fh) Mode Select / Mode Sense Data Compression page code 0Fh has been added to Seagate tape drives that support hardware data compression. A Seagate tape drive that supports hardware data compression can be detected by first requesting the available Mode Sense pages (Mode Sense page code 3Fh). -
Page 52: Parameters That Control Data Compression
Chapter 5 SCSI Interface Parameters that control data compression A Data Compression Enable (DCE) bit of one indicates that data compression is to be enabled. When this bit is set, data sent to the Drive by the Host shall be processed using the ALDC compression algorithm prior to being written to the medium. -
Page 53: Tape Format
1. Thus, track 3 is above track 1, and track 5 is above track 3, and so up to track 71, which is the closest to the upper edge of the tape. STT20000N Product Manual Page 45... -
Page 54: Track Numbering
Chapter 6 Tape format Track numbering All even numbered tracks, and the Directory Track, are recorded in the forward direction (the direction from the BOT marker to the EOT marker). All odd numbered tracks are recorded in the reverse direction (the direction from the EOT marker to the BOT marker). - Page 55 • An EOD frame is an absolute indicator of the end of the recorded data. It is recorded after the last frame containing host data upon terminating a Write process. STT20000N Product Manual Page 47...
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Page 56: Blocks
Chapter 6 Tape format Blocks Information in the Block Control byte determines the type of block being recorded except for ECC blocks which are recognized by their block numbers. Also, information about the number of user data bytes available in each data block is recorded in the Block Control byte of the block. -
Page 57: Write Equalization
To reduce problems resulting from long strings of repetitive data with a bad peak shift or amplitude characteristics, a data randomizer algorithm is used on all bytes in the data and control area of each block. This randomizing takes place prior to the encoding of the data. STT20000N Product Manual Page 49... - Page 58 Chapter 6 Tape format Notes Page 50 STT20000A Product Manual...
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Page 59: Theory Of Operations
This chapter describes the drive in more detail and explains implementation specific information. Drive configurations The drive may be configured as Standard (STT20000N) or NS (STT20000N-C). The NS configuration has all the features of the Standard drive with the following additions: •... - Page 60 5 1 2 K B D R A M S E N S O R S Figure 7-1b Simplified Block Diagram of the STT20000N-C Drive 2 5 6 K B 1 8 8 u P 4 0 M H z...
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Page 61: Mechanics
The microprocessor directs all functions performed by the control logic. The instructions are read from a flash EEPROM, which can be updated with new firmware through either the SCSI interface or a specially written tape cartridge. STT20000N Product Manual Page 53... -
Page 62: Head Design
• Issuing a WRITE DATA BUFFER SCSI command to download the firmware to the EEPROM. Refer to Chapter 4 for information about loading new firmware using a Seagate firmware upgrade cartridge. Sensors and switches A number of mechanical and optical sensors and switches are integrated in the drive design. -
Page 63: Media (Travan Minicartridges)
The position of the sliding write- protect tab on the cartridge determines whether or not data can be written to the tape. See Chapter 4 for illustrations of the write-protect position. STT20000N Product Manual Page 55... -
Page 64: Read-While-Write
Theory of operations Read-While-Write The STT20000N-C (NS-20) drive is able to read back the data it has just written, hence the term read-while-write check. A different head is utilized in the NS drive to accomplish this task along with some additional playback circuitry. The digital control ASIC is the same for NS and standard drives, but the NS drive enables the CRC checking circuitry necessary to perform the read-while-write check. -
Page 65: Glossary
Compressed data requires less storage space than uncompressed data. Data Density—The number of single-byte characters stored per unit length of track. Usually expressed as bits-per-inch (bpi). Decompression—The process of restoring compressed data to its original state. Dew—Collection of moisture in a tape drive. STT20000N Product Manual Page 57... - Page 66 Appendix A Glossary Directory track—The track at the centerline of the tape, identified as track 254 by its Track ID frame. Disc Drive—A peripheral storage device that rotates the disk, writes data onto it, and reads data from it as instructed by a program.
- Page 67 Uncorrected Bit Error Rate—The probability of a bit being in error, without using any error correction techniques. Underrun—A condition developed when the host transmits or receives data at a rate less than required by the device for streaming operation. STT20000N Product Manual Page 59...
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Page 68: Acronyms And Units Of Measurement
Appendix B Acronyms and units of measurement Acronyms and units of measurement Acronyms and abbreviations Acronym Meaning ANSI American National Standards Institute BIOS Basic Input Output System Beginning of Media Beginning Of Tape Bits Per Inch Compact Disc CMOS Complementary Metal-Oxide Semiconductor Canadian Standard Association Direct Memory Access... - Page 69 Mean Time To Repair Original Equipment Manufacturer Printed Circuit Board Quarter Inch Cartridge Drive Standards, Incorporated Random Access Memory Run Length Limited SCSI Small Computer System Interface Underwriters' Laboratories, Inc. Volts Direct Current Verband Deutscher Electrotechniker STT20000N Product Manual Page 61...
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Page 70: Units Of Measurement
Appendix B Acronyms and units of measurement Units of measurement Measure Meaning Celsius or Centigrade centimeter decibels, A-weighted sound power reference one picowatt Fahrenheit foot or feet acceleration of a free-falling body; equal to 32.17 feet per second Gbyte gigabyte Hertz inch kilo...
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