Set Features command | Seagate ST96023AS, ST980825AS, ST94015AS

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 8: 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
55H	Disable read look-ahead (read cache) feature.
82H	Disable write cache
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.

Momentus 7200.1 SATA Product Manual, Rev. B

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Seagate ST96023AS, ST980825AS, ST94015AS, ST910021AS manual Set Features command values

Contents

ST910021AS ST980825AS ST96023AS ST94015AS Momentus 7200.1 SataPage Contents Momentus 7200.1 Sata Product Manual, Rev. B List of Figures Page Introduction About the Serial ATA Sata interface Specification summary table Drive specifications Track-to-track seek time msec typical LBA mode Default logical geometryFormatted capacity Cylinders Read/write heads Sectors per track 16,383 Drive specification Physical characteristicsPhysical organization Recording and interface technology Start/stop times Seek timeTypical seek times Typical seek times msec Read Write Power specifications Deferred spinup Typical current profilesAdditional details Power management modes Power-management modesActive mode Idle mode Environmental specifications Operating shock ShockNonoperating shock Vibration Electromagnetic immunity AcousticsDrive level acoustics Radio frequency environments Measurement type Specification Safety certificationReliability Agency certification Australian C-Tick N176 Korean RRLFCC verification European Union Restriction of Hazardous Substances RoHS Environmental protection Corrosive environment Momentus 7200.1 Sata Product Manual, Rev. B Handling and static-discharge precautions Configuring and mounting the drive Serial ATA cables and connectors Configuring the drive Drive mounting Mounting dimensions-top, side and end view Momentus 7200.1 Sata Product Manual, Rev. B Signal Serial ATA connector pin definitionsSerial ATA Sata interface Segment Pin Function Definition P10 Ground 2nd mate P11 Reserved Pin Function Definition Command name Command code in hex ATA-standard commands Supported ATA commands ATA-standard power-management commands Command name Command code in hex Momentus 7200.1 Sata Product Manual, Rev. B Word Description Value Identify Device command Xx07H Bit Word Description if bit is set to Bit Word Set Features command values Set Features command A.R.T. commands 3 S.M.A.R.T. commandsCode in features register A.R.T. command Internet Seagate Technology support servicesPresales Support Technical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index ITE Sata Momentus 7200.1 Sata Product Manual, Rev. B Page Seagate Technology LLC