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DAT 72 and DDS-4 Tape Drives
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CD72LWH
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CD72LWE
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STD1401LW
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STD2401LW
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STD6401LW
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Product Manual
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Table of Contents
Related Manuals for Seagate CD72LWH
Summary of Contents for Seagate CD72LWH
- Page 1 ..CD72LWH ........
- Page 2 Copyright © 2003 by Certance LLC. All Rights Reserved.. Part Number: 50000712, June 2003 Certance and the Certance logo are trademarks of Certance LLC. Seagate is a trademark of Seagate Technology LLC. Other product names are trademarks or registered trademarks of their respective owners.
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Page 3: Fcc Notice
U.S. Government Printing Office, Washington, DC 20402. Warning. Changes or modifications made to this equipment which have not been expressly approved by Seagate may cause radio and television interference problems that could void the user’s authority to operate the equipment. -
Page 4: About This Manual
About This Manual This is the product manual for DAT 72 and DDS-4 internal and external tape drives. It describes how to use the DAT 72 and DDS-4 drives. Following are brief descriptions of the sections in this manual. Chapter 1, “Introduction” provides general specifications, features and an overview on DDS technology. -
Page 5: Table Of Contents
Contents Contents Introduction Overview........................1 DDS Format Standard Compatibility ..............1 DAT 72 and DDS-4 Capacity and Transfer Rates ..........2 Features ........................3 DAT 72 and DDS-4 Drive Models................4 Specifications Overview........................7 Physical Specifications ....................7 Power Specifications ....................9 Drive Performance Specifications ................ - Page 6 How to Clean the Tape Heads ................32 Automatic Drive Spin-Down and Write...............32 Operating the Drive in High-Temperature or Humidity Conditions ......32 Data Compression .....................33 Loading Revised Firmware from Seagate Firmware Cartridges........33 Flash Memory......................33 Firmware Download Process via Tape ...............33 Theory of Operations Overview........................35...
- Page 7 Contents Simplified Decompression Operation..............48...
- Page 8 DAT 72/DDS Product Manual Figures Figure 1. 3.5-Inch Internal Drive ........................4 Figure 2. Internal Drive with Drive Rails for Mounting in a 5.25-inch Drive Bay ..........4 Figure 3. External Drive .............................5 Figure 4. Internal Drive—Dimensions ........................8 Figure 5. Internal DDS Drive with Rails—Dimensions ..................8 Figure 6.
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Page 9: Introduction
The DAT 72 and DDS-4 drives combine established DAT technology, high-density recording and hardware data-compression capability along with Seagate’s proven computer-grade design to provide unmatched reliability and performance characteristics among DDS products. The DAT 72 and DDS-4 drives are ideal for workstation, server, and network/enterprise applications such as: •... -
Page 10: Dat 72 And Dds-4 Capacity And Transfer Rates
DAT 72/DDS-4 Product Manual The DAT 72 and DDS-4 drives support DDS data compression. Compression doubles a drive’s uncompressed capacity. For example, a 20 GB uncompressed drive will be 40 GB with compression. The DDS-4 drive complies with the following guidelines and specifications: •... -
Page 11: Features
Introduction In data-compression mode, the Seagate DAT 72 and DDS-4 drives typically double the storage capacity and transfer rate of the native uncompressed operation. Tape capacity and the sustained data-transfer rate are dependent upon the characteristics of the files being compressed, the application software used, and system parameters such as the speed of the host and the operating system. -
Page 12: Dat 72 And Dds-4 Drive Models
DAT 72/DDS-4 Product Manual DAT 72 and DDS-4 Drive Models The DAT 72 and DDS-4 3.5-inch and 5.25-inch internal drives are tailored for easy installation in today’s computers, and the full-featured embedded SCSI controller facilitates easy integration into a variety of systems. DAT 72 and DDS-4 models include: •... -
Page 13: Figure 3. External Drive
Introduction Figure 3. External Drive... - Page 14 DAT 72/DDS-4 Product Manual...
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Page 15: Specifications
Specifications Specifications Overview This chapter includes technical specifications for the internal and external SCSI drives. This information covers the following specifications and requirements: • Physical specifications • Power specifications • Drive performance specifications • Environmental requirements • Reliability • DDS cartridge specifications •... -
Page 16: Figure 4. Internal Drive-Dimensions
DAT 72/DDS-4 Product Manual 41.3 mm 101.6 mm (1.63 in) (4.00 in) 13.0 mm (0.51 in) 2 places 3.8 mm (0.15 in) 5.0 mm (0.196 in) 94.0 mm 2 places (3.70 in) M3.0 x 4 deep min. (10 places) 146.0 mm (5.75 in) M3.0 x 4 deep min. -
Page 17: Power Specifications
Specifications Power Specifications The following table lists the power specifications for the internal DAT 72 and DDS-4 drives. Specification +12 VDC supply +5 VDC supply Voltage Tolerance + or – 10% operating + or – 7% operating Operational Current 250 milliamps max 1.35 Amps max Standby Current 15 milliamps max... -
Page 18: Drive Performance Specifications
DAT 72/DDS-4 Product Manual Drive Performance Specifications The following table lists the specifications for the DAT 72 drive. Specification Value Capacity 125 m MP++ 24.0 Gbytes 150 m MP+++ 40.0 Gbytes 170 m MP++++ 72.0 Gbytes Error recovery Read-after-write (RAW) Reed Solomon ECC (C3 - 3 levels) Track density (DAT 72) 4704 tracks per inch (TPI) - Page 19 Specifications The following table lists the specifications for the DDS-4 drive. Specification Value Capacity (with 2:1 compression) 90 m MP 4.0 Gbytes 120 m MP+ 8.0 Gbytes 125 m MP++ 24.0 Gbytes 150 m MP+++ 40.0 Gbytes Track density (DDS) 147.34 tracks per mm Error recovery Read-after-write...
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Page 20: Environmental Requirements
DAT 72/DDS-4 Product Manual Environmental Requirements The following table lists the environmental specifications for DAT 72 and DDS-4 drives. The internal drive should meet these standards if mounted either vertically (on its side) or horizontally (right side up). Specification Operational Nonoperational Temperature to +113... -
Page 21: Mean Time Between Failures
The MTTR for DAT products is less than 0.5 hour (30 minutes). The Seagate DDS drives are field-replaceable units. If a problem occurs with a subassembly or component in the drive, you should replace the entire unit. Return the drive to the factory in its original packaging. -
Page 22: Regulatory Compliance
DAT 72/DDS-4 Product Manual Regulatory Compliance The DAT 72 and DDS-4 drives comply with the regulations listed in the following table. Agency Regulation C22.2, No. 950-M89 TUV-RHEINLAND EN 60 950 1950 Class A and Class B CE compliance 1. Required compliance for external model; verification on file for internal models. Use these drives only in equipment where the combination has been determined to be suitable by an appropriate certification organization (for example, Underwriters Laboratories Inc. -
Page 23: Installation
Place shipping containers on a flat, clean, stable surface; then carefully remove and verify the contents against the packing list. If parts are missing or the equipment is damaged, notify your Seagate representative. Always save the containers and packing materials for a future reshipment. -
Page 24: Guidelines And Cautions
DAT 72/DDS-4 Product Manual Note: Internal drives come in two mounting configurations for 3.5-inch and 5.25-inch drive bays, respectively. Drives configured for 5.25-inch bays are identical to those used for 3.5-inch bays, except for the addition of drive mounting brackets on each side of the drive and a different front bezel. Installation procedures are the same for both drive configurations. -
Page 25: Figure 6. Jumper Settings For An Internal Drive
Installation Default jumper settings shown (SCSI ID 6, parity checking enabled, and termination power disabled) Pins: Function: SCSI ID bit 0 SCSI ID bit 1 SCSI ID bit 2 SCSI ID bit 3 9-10 Parity checking 11-12 Termination Power SCSI ID=0 SCSI ID=8 SCSI ID=1 SCSI ID=9... -
Page 26: Dip Switch Settings
DAT 72/DDS-4 Product Manual Terminator Power (Pins 11 and 12) Internal DAT 72 and DDS-4 drives are shipped with terminator power disabled (no jumper across pins 11 and 12, as shown in Figure 6). You can enable terminator power, if necessary, by placing a jumper across pins 11 and 12. Note 1: If the termination power jumper is installed, be careful not to short the TERMPWR signal to ground (for example, by attaching the SCSI cable upside down). - Page 27 SCSI Inquiry command. When switch 10 is ON (the default setting), the Vendor ID is “SEAGATE DAT.” When switch 10 is OFF the Vendor ID is “ARCHIVE Python.” The “ARCHIVE Python” Vendor ID may be used by independent software vendors to...
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Page 28: Mounting An Internal Drive
DAT 72/DDS-4 Product Manual Mounting an Internal Drive You can install your Seagate internal DDS drive horizontally or vertically (on its side). Figure 8 shows a 3.5-inch drive being installed in a typical system using side mounting screws. Mounting the Drive in a 3.5-Inch Drive Bay Mount the drive in a 3.5-inch drive bay and... -
Page 29: Figure 10. Mounting Holes For An Internal Drive In A 5.25-Inch Configuration (With Mounting Brackets)
Installation Mounting the Drive in a 5.25-Inch Drive Bay If you are mounting the drive in a 5.25-inch drive bay, you must use a drive with mounting brackets attached. As shown in Figure 10, the 5.25-inch drive brackets have four screw holes on the bottom and six on each side. 41.3 mm (1.63 in) 31.5 mm (1.24 in) -
Page 30: Figure 11. Interface Connector On An Internal Drive
DAT 72/DDS-4 Product Manual Ultra2 SCSI 68-pin pin 34 pin 1 high-density connector pin 35 pin 68 Figure 11. Interface Connector on an Internal Drive SCSI Termination The internal DAT 72 and DDS-4 drives do not provide SCSI termination. For this reason, they should not be the last device on a SCSI chain. -
Page 31: Figure 13. Power Connector On The Internal Drives
Installation The recommended 4-pin power connector for the internal drive is an AMP 1-48024-0 housing with AMP 60617-1 pins or their equivalent. Power connector pin 4 pin 1 pin 3: GND pin 2: GND (+5V return) (+12V return) Figure 13. Power Connector on the internal Drives... -
Page 32: Installing An External Drive
DAT 72/DDS-4 Product Manual Installing an External Drive The external drive is a compact external SCSI device that connects to the host computer as a turnkey subsystem. Installing the external drive involves three simple steps: Configuring the drive Connecting the SCSI interface cable Connecting the power cord Configuring the External Drive The following is the default configuration for the external drive:... -
Page 33: Connecting The Scsi Interface Cable
Installation Connecting the SCSI Interface Cable The external drive provides two 68-pin, shielded connectors on the rear panel of the enclosure. Either connector can be used as a SCSI IN or SCSI OUT connection (you can use either connector to attach the drive to the host computer or to another SCSI device). - Page 34 DAT 72/DDS-4 Product Manual...
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Page 35: Drive Operation And Maintenance
Drive Operation and Maintenance Loading a Cartridge Seagate DAT drives have a front-loading cartridge bay for easy operation. The drive- bay door opens automatically when a cartridge is inserted. Figure 16 shows a cartridge being inserted into a 3.5-inch internal drive. After you insert the cartridge, there is a brief delay while the drive identifies the cartridge type and state and moves the tape to the data area. -
Page 36: Initializing A Blank Cartridge
Initializing a blank tape takes about 30 seconds. DDS Cartridge Compatibility The Seagate DAT 72 and DDS-4 drives are designed to use data-grade DAT cartridges, which comply with ANSI specifications listed in the “3.81 mm Helical-Scan Digital Computer Tape Cartridge for Information Interchange,” ANSI X3B5/89-156 standard. -
Page 37: Led Codes
Drive operation and maintenance Write protected Write enabled Figure 18. Write-Protect Tab on a DDS Cartridge LED Codes As shown in Figure 19, the front panel of the DDS drive contains three LEDs that provide information about both normal and error conditions. The external drive also includes a green power-on LED on the front panel. -
Page 38: Clean Led
DAT 72/DDS-4 Product Manual Clean LED If the Clean LED is ON continuously, the drive requires cleaning. Use only an approved DDS cleaning cartridge. Following is a guideline for cleaning intervals based upon drive type: • DDS-4 DDS2, DDS3, or DDS4 media has been operating in the drive for at least 50 hours. -
Page 39: Led Code Summary
If the tape does not eject within 2 minutes, press and hold the eject button continuously for more than 5 seconds. The tape should eject within 40 seconds. Contact Seagate Technical Support for more information. -
Page 40: How To Clean The Tape Heads
How to Clean the Tape Heads To clean the tape heads on your drive, use only a Seagate-qualified DDS cleaning cartridge. Seagate offers a cleaning cartridge, Model STDMCL or CDMCL, available from http://shop.certance.com. Do not use an audio DAT cleaning cartridge. The drive cannot recognize it. -
Page 41: Data Compression
(see "Data compression (switches 1 and 2)" in Chapter 3). When reading, the drive automatically selects compressed or uncompressed mode, depending on the data that is read. Loading Revised Firmware from Seagate Firmware Cartridges Flash Memory Another technological advancement incorporated into the DAT 72 and DDS-4 drives is flash memory, which is useful if the drive’s SCSI firmware needs to be upgraded. - Page 42 At this time, it is recommended that you power cycle the drive to refresh any new parameter information and to execute the power-on self-test to ensure proper unit functionality. Firmware upgrade cartridges are available only to qualified Seagate OEM customers. Contact your Seagate sales representative for information. Note:...
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Page 43: Theory Of Operations
Theory of operations Theory of Operations Overview The Seagate DAT 72 and DDS-4 tape drive design integrates DAT technology (helical scan recording method) into a true computer-grade data-storage peripheral with industry-standard data-compression capability. These drive designs are the result of: •... - Page 44 DAT 72/DDS-4 Product Manual factor. These design features are also important contributors to the overall reliability, durability and performance of the drive. The mechanism is designed for minimum tape wear and prevention of damage to the tape. The modes or operational states, such as stop, rewind and play, reduce mechanism and tape wear.
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Page 45: Figure 20. Four-Head Cylinder Design
Theory of operations Figure 20 illustrates a helix track and the four-head design, and shows the 102-degree wrap angle. 6˚ Drum inclination angle Direction of drum rotation: Write Head B Read Head B Read Head A Write Head A Tape Tape Direction Drum... -
Page 46: Motors And Control Circuits
DAT 72/DDS-4 Product Manual Motors and Control Circuits The drive uses four direct-drive, brushless motors—the capstan, cylinder and two reel motors. Using these small, direct-drive motors provides maximum reliability. The cylinder motor rotates the cylinder. The capstan motor moves the tape. The mode motor loads and ejects the cartridge. -
Page 47: Sensors
Theory of operations Refer to Chapter 4 for information about loading new firmware using a Seagate firmware upgrade cartridge. Sensors A number of mechanical and optical sensors are integrated in the drive design. The cartridge in and cartridge loading sensors are mechanical sensors that determine the position of the loading mechanism. -
Page 48: Media Recognition System (Mrs)
All DDS tape cartridges with the MRS striping either have the MRS logo, the MRS acronym or media recognition system printed on them to readily distinguish them from audio-grade media. Audio-grade media is not suitable for data or computer backup purposes. Seagate DAT drives eject audio tapes. About the Data Cartridge The tape drive is designed to use data-grade DDS/DAT cartridges, which comply with the specifications in the 3.81-mm Helical-Scan Digital Computer Tape Cartridge... -
Page 49: Figure 22. Dds Drive Cartridge Design Features
Theory of operations File Protect Hole (Restorable) Recognition Holes (1, 2, 3, 4) Datum Holes Slider Lock (1) Slider Lock (2) Lid Lock (Locked by Slider) Figure 22. DDS Drive Cartridge Design Features Qualified DDS cartridges are designed with specific write-protect, lid and other features for information interchange and are tested to comply with the ANSI DDS specifications. - Page 50 DAT 72/DDS-4 Product Manual...
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Page 51: Data Compression
Data compression Data Compression Introduction Overview Typical data streams of text, graphics, software code or other forms of data contain repeated information of some sort, whether it is at the text level where you can readily recognize regular repetitions of a single word or at the binary level where the repetitions are in bits or bytes. -
Page 52: Data Compression Considerations
Additionally, the data compression method must adapt to different data types, automatically providing optimum handling for all types of data. Considering these factors, Seagate engineers concluded: The most effective data compression method must compress as much data as possible while assuring that •... -
Page 53: Hardware Compression
Seagate’s data compression engine is designed to provide a complete data compression system using the DCLZ algorithm. This IC provides support circuitry as well as the core DCLZ compression machine. -
Page 54: Dclz Algorithm
DAT 72/DDS-4 Product Manual DCLZ Algorithm Within the computer industry, algorithms developed by Abraham Lempel and Jacob Ziv (enhanced later by Terry Welch) are popular, versatile and powerful compression methods. These LZ algorithms are basically of two types—LZ1, a sliding window method, and LZ2/LZW, a hashed directory method. -
Page 55: Dictionary
Data compression The following table illustrates this simplified operation. Input Current Build Output Code Match Byte String Entry Value — — — — — — — — — — — — — — — — (IN) — — — — —... - Page 56 DAT 72/DDS-4 Product Manual • Dictionary codes, codewords 264 through 4,095: The dictionary codes refer to dictionary entries and represent multiple bytes (a string of characters) in the input data stream. These codes are built as the input stream is processed. These codes are pointers to other locations and eventually end by pointing to one of the byte values 0 through 255.
- Page 57 Data compression The following steps describe a simplified version of the operation of the algorithm for decompressing data. From a reset dictionary point, (which contains only control codes and encoded bytes) codewords are fetched from the input stream and looked up in the dictionary.
- Page 59 Publication Number: 50000712 Printed in USA...
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