Seagate ST3250310CS manual Set Features command values

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4.3.2Set Features command

This command controls the implementation of various features that the drive supports. When the drive receives this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an inter- rupt. 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 indi- cated above.

DB35.4 Series SATA Product Manual, Rev. B

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Contents ST3250310CS DB35.4 Series SataRevision Date Revision historyContents DB35.4 Series Sata Product Manual, Rev. B List of Figures Page Introduction About the Serial ATA interface Specification summary tables Drive specificationsDrive specification ST3250310CS Drive specifications summary for 250 Gbyte modelDB35.4 Series Sata Product Manual, Rev. B Recording and interface technology Default logical geometryLBA mode Formatted capacityTypical seek times msec Read Write Physical characteristicsSeek time Start/stop timesPower specifications Voltage tolerance Typical current profilesConducted noise Sleep mode Power-management modesActive mode Idle modeEnvironmental specifications Nonoperating vibration VibrationOperating vibration Test for Prominent Discrete Tones PDTs Drive A-weighted Sound Power Levels SWL, BAAcoustics emissions Electromagnetic immunityAnnualized Failure Rate AFR Safety certificationReliability Agency certificationFCC verification Korean RRLAustralian C-Tick N176 China Restriction of Hazardous Substances RoHS Directive Environmental protectionCorrosive environment Handling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveDrive mounting Mounting dimensionsDB35.4 Series Sata Product Manual, Rev. B Hot-Plug compatibility Serial ATA Sata interfacePin Function Definition Serial ATA device plug connector pin definitionsSerial ATA connector pin definitions SignalCommand name Command code in hex Supported ATA commandsSupported ATA commands F4H Word Description Value Identify Device commandXx07H 129 Seagate-reserved Bit Word Description if bit is set to Bit WordSet Features command values Set Features commandCode in features register A.R.T. command 3 S.M.A.R.T. commandsA.R.T. commands Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index ITE Page DB35.4 Series Sata Product Manual, Rev. B Page Seagate Technology LLC