Seagate ST32000641AS manual Set Features command values

Page 33

4.3.2Set Features command

This command controls the implementation of various features that the drive supports. When the drive receives this com- mand, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value in the register does not represent a feature that the drive supports, the command is aborted. Power-on default has the read look-ahead and write caching features enabled. The acceptable values for the Features register are defined as follows:

Table 7: Set Features command values

02H

Enable write cache (default).

03H

Set transfer mode (based on value in Sector Count register).

 

Sector Count register values:

 

00H

Set PIO mode to default (PIO mode 2).

 

01H

Set PIO mode to default and disable IORDY (PIO mode 2).

 

08H

PIO mode 0

 

09H

PIO mode 1

 

0AH

PIO mode 2

 

0BH

PIO mode 3

 

0CH

PIO mode 4 (default)

 

20H

Multiword DMA mode 0

 

21H

Multiword DMA mode 1

 

22H

Multiword DMA mode 2

 

40H

Ultra DMA mode 0

 

41H

Ultra DMA mode 1

 

42H

Ultra DMA mode 2

 

43H

Ultra DMA mode 3

 

44H

Ultra DMA mode 4

 

45H

Ultra DMA mode 5

 

46H

Ultra DMA mode 6

10H

Enable use of SATA features

55H

Disable read look-ahead (read cache) feature.

82H

Disable write cache

90H

Disable use of SATA features

AAH

Enable read look-ahead (read cache) feature (default).

F1H

Report full capacity available

Note.

At power-on, or after a hardware or software reset, the default values of the features are as indicated above.

Barracuda XT Series SATA Product Manual, Rev. C

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Contents
ST32000641AS Barracuda XT Series SataRevision Date Sheets affected or comments Revision historyContents Barracuda XT Series Sata Product Manual, Rev. C List of Figures Barracuda XT Series Sata Product Manual, Rev. C Introduction About the Serial ATA interface Drive specifications summary for 2000GB models Drive specificationsRanty information for your drive LBA mode Default logical geometryFormatted capacity Recording and interface technologyPhysical characteristics Start/stop times2000GB model Power specifications Typical current profiles Active mode Power management modesIdle mode Sleep modeEnvironmental specifications Operating shock ShockNonoperating shock VibrationAcoustics Drive A-weighted Sound Power Levels SWL, BAElectromagnetic immunity Test for Prominent Discrete Tones PDTsSafety certification WarrantyAgency certification Electromagnetic Compatibility EMCKorean RRL Australian C-Tick N176FCC verification Corrosive environment Environmental protectionHandling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveDrive mounting Mounting dimensions 2000GB modelHot-Plug compatibility Serial ATA Sata interfaceSerial ATA connector pin definitions Serial ATA device plug connector pin definitionsSignal Segment Pin Function DefinitionSupported ATA commands Supported ATA commandsCommand name Command code in hex F3H Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit WordBarracuda XT Series Sata Product Manual, Rev. C Set Features command values Set Features command3 S.M.A.R.T. commands A.R.T. commandsCode in features register A.R.T. command Seagate Technology support services Presales SupportTechnical Support Warranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index RRL Page Barracuda XT Series Sata Product Manual, Rev. C Page Seagate Technology LLC
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