Seagate STD2401LW-S Manuel

Important information about this documentThe following document, the Scorpion 40 DDS-4 Tape Drive Product Manual, is the complete guide for this tape

vContentsSimplified compression operation ...46Dictionary ...

viScorpion 40 DDS-4 Product ManualFiguresFigure 1. 3.5-Inch Internal Scorpion 40...

Introduction1IntroductionOverviewThe Seagate® Scorpion® 40 digital data storage (DDS) drive is designed forcomputer environments that require high-per

2Scorpion 40 DDS-4 Product Manual, Version A• The DDS recording format standard, ANSI/ECMA-139, 3,81mm Wide MagneticTape Cartridge for Information Int

Introduction3The Scorpion 40 provides superb reliability through three levels of error-correctioncode (ECC) and the four-head design, which provides f

4Scorpion 40 DDS-4 Product Manual, Version A• A 3.5-inch, half-height DDS-4 drive that mounts internally–model STD1401LW(see Figure 1).Figure 1. 3.5-

Introduction5Figure 3. External Scorpion 40

Specifications7SpecificationsOverviewThis chapter includes technical specifications for the internal and external SCSIdrives. This information covers

8Scorpion 40 DDS-4 Product Manual, Version A41.3 mm(1.63 in)101.6 mm(4.00 in)101.6 mm(4.00 in)94.0 mm(3.70 in)3.8 mm (0.15 in)13.0 mm (0.51 in)2 place

Specifications9Power SpecificationsThe following table lists the power specifications for the internal Scorpion 40 drives.Specification +12 VDC supply

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10Scorpion 40 DDS-4 Product Manual, Version ADrive Performance SpecificationsThe following table lists the specifications for the Scorpion 40 drive.Sp

Specifications11Environmental RequirementsThe following table lists the environmental specifications for DDS drives. The internaldrive should meet the

12Scorpion 40 DDS-4 Product Manual, Version Amaintenance periods. Operational time is assumed to be 20 percent of the power-ontime. Operational time i

Specifications13Regulatory ComplianceThese DDS drives comply with the regulations listed in the following table.Agency RegulationCSA C22.2, No. 950-M8

Installation15InstallationIntroductionThis chapter explains how to install the Scorpion 40 drive. Some of the informationrelates to all models; other

16Scorpion 40 DDS-4 Product Manual, Version ANote: Internal Scorpion 40 drives come in two mounting configurations for 3.5-inchand 5.25-inch drive ba

Installation17remote SCSI address selection. Figure 6 shows the locations of the jumper blocksfor the internal Scorpion 40.SCSI ID=0SCSI ID=1SCSI ID=2

18Scorpion 40 DDS-4 Product Manual, Version AParity checking (pins 9 and 10)If a jumper is installed on pins 9 and 10 (the default setting), parity ch

Installation19Data compression (switches 1 and 2)If switch 1 is ON (the default setting), hardware data compression is enabled. Ifswitch 1 is OFF, har

20Scorpion 40 DDS-4 Product Manual, Version AMounting an internal Scorpion 40You can install your Seagate internal DDS drivehorizontally or vertically

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Installation21Mounting the drive in a 5.25-inch drive bayIf you are mounting the drive in a 5.25-inch drive bay, you must use a drive withmounting bra

22Scorpion 40 DDS-4 Product Manual, Version AUltra2 SCSI 68-pin high-density connectorpin 34pin 68pin 35pin 1Figure 11. Interface and power connector

Installation23Connecting a power cableAttach a four-pin power cable to the power connector on the back of the drive. Figure13 shows the location of th

24Scorpion 40 DDS-4 Product Manual, Version AInstalling an external Scorpion 40The external Scorpion 40 is a compact external SCSI device that connect

Installation25Connecting the SCSI interface cableThe Scorpion 40 provides two 68-pin, shielded connectors on the rear panel of theenclosure. Either co

Drive operation and maintenance27Drive Operation and MaintenanceLoading a cartridgeSeagate DDS drives have a front-loading cartridge bay for easy oper

28Scorpion 40 DDS-4 Product Manual, Version ACleanLEDMediaLEDEjectButtonDriveLEDFigure 17. Location of Eject button and LEDs on internal Scorpion 40

Drive operation and maintenance29Write-protecting a cartridgeFigure 18 shows how to write-protect or write-enable a DDS tape using the slidingwrite-pr

30Scorpion 40 DDS-4 Product Manual, Version AClean LEDThe Clean LED functions as follows:• If the Clean LED is ON continuously, the drive requires cle

Drive operation and maintenance31LED Code summaryThe following table summarizes LED flash codes for the Scorpion 40.LED Action Meaning Clean ON (lit)

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32Scorpion 40 DDS-4 Product Manual, Version ASeagate Express at 1-800-656-8419. Do not use an audio DAT cleaning cartridge.The drive cannot recognize

Drive operation and maintenance33Data compressionDefault operation for the Scorpion 40 drive is to have data compression enabled—the drive automatical

34Scorpion 40 DDS-4 Product Manual, Version A4. The drive automatically recognizes the firmware upgrade cartridge and beginsdownloading the firmware f

Theory of operations35Theory of operationsOverviewThe Scorpion 40 tape drive design integrates DAT technology (helical scan recordingmethod) into a tr

36Scorpion 40 DDS-4 Product Manual, Version AThe STD1401LW drive mechanismThe Scorpion 40 uses the helical scan recording method with a four-head cyli

Theory of operations37advantage of this design is that a RAW check is performed immediately after thedata is written.As mentioned earlier, the cylinde

38Scorpion 40 DDS-4 Product Manual, Version AWrite head BWrite head A20˚ head azimuth3 tape tracksFigure 21. Alternating azimuth angles on tape track

Theory of operations39Flash memoryBecause the Scorpion 40 uses flash memory, the drive firmware can be easilyupgraded when new revisions of the firmwa

40Scorpion 40 DDS-4 Product Manual, Version Aframes have been written. Any frame can be rewritten multiple times to provide forskipping over bad areas

Theory of operations41Note. Proper maintenance of the drive requires that you use the DDS head-cleaning cartridge after every 25 hours of read/write o

© 1999 Seagate Technology, Inc. All rights reservedPublication Number: 10006598-001, Version A, October 22, 1999Seagate, Seagate Technology, the Seaga

Data compression43Data compressionIntroductionData compression—generalTypical data streams of text, graphics, software code or other forms of data con

44Scorpion 40 DDS-4 Product Manual, Version AData Compression ConsiderationsIn an effective data-compression method, several factors are important:• T

Data compression45Hardware compressionIf data compression is used in software on the host computer rather than in thehardware of the drive, you can sl

46Scorpion 40 DDS-4 Product Manual, Version ADCLZ algorithmWithin the computer industry, algorithms developed by Abraham Lempel and JacobZiv (enhanced

Data compression47The following table illustrates this simplified operation.InputByteCurrentStringMatchBuildEntryOutput CodeValueRR Y — —IRI NRI(R)—I

48Scorpion 40 DDS-4 Product Manual, Version A• Dictionary codes, codewords 264 through 4,095: The dictionary codes referto dictionary entries and rep

Data compression49The following steps describe a simplified version of the operation of the algorithm fordecompressing data.1. From a reset dictionary

Seagate Technology, Inc.920 Disc Drive, Scotts Valley, California 95066, USAPublication Number: 10006589-001, Version A Printed in USA

A MAN US DDS-4 USR GDE V0 10/9985054218505421.fm Page 2 Wednesday, October 27, 1999 10:20 AM

FCC NoticeThis equipment generates and uses radio frequency energy and, if not installed andused properly—that is, in strict accordance with the manuf

About This ManualAll information contained in or disclosed by this document is considered proprietaryby Seagate Technology. By accepting this material

iiiContentsContentsIntroduction 1Overview.......

ivScorpion 40 DDS-4 Product ManualDrive Operation and Maintenance 27Loading a cartridge ................