Seagate ST9120821AB, ST98823AB, ST94813AB, ST96812AB Set Features command, Features register values

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4.1.3Set 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:			Features register 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

05H		Enable advanced power management

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 indicated above.

28	Momentus 5400.2 Blade Server Product Manual, Rev. B

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Contents Momentus5400.2 Blade Server ST9120821AB ST9100824AB ST98823AB ST96812AB ST94813ABPage Contents Momentus 5400.2 Blade Server Product Manual, Rev. B List of Figures Momentus 5400.2 Blade Server Product Manual, Rev. B Introduction Momentus 5400.2 Pata disc driveMomentus 5400.2 Blade Server Product Manual, Rev. B Specification summary Drive specificationsSpecifications Specifications Formatted capacity Default logical geometryLBA mode Physical organizationTechnology Specification Physical characteristicsRecording and interface technology Typical seek times msec Read Write Seek timeTime to ready Time to ready Typical Max @ 25CPower specifications Conducted noise Typical current profileVoltage tolerance Environmental specifications Nonoperating shock ShockOperating shock VibrationDrive level acoustics AcousticsElectromagnetic immunity Electromagnetic immunityReliability Safety certificationMeasurement type Specification Agency certificationAustralian C-Tick N176 Korean RRLFCC verification Corrosive environment Environmental protectionEuropean Union Restriction of Hazardous Substances RoHS Momentus 5400.2 Blade Server Product Manual, Rev. B Configuring and mounting the drive Handling and static discharge precautionsMaster/slave configuration Jumper settingsCable-select option Mounting dimensions-top, side and end view Drive mountingMomentus 5400.2 Blade Server Product Manual, Rev. B Connector Cable Signal Name Contact Conductor ATA interface signals and connector pinsConnector signals Cable Connector Conductor Contact Signal NameSupported commands Supported ATA commandsCommand name Command code in hex ATA-standard commands ATA-standard power-management commands Command name Command code in hexATA-standard security commands Supported commands Identify Device command Word Description ValueXx07H Description if bit is set to Bit Word Bit WordSet Features command Features register valuesPresales Support Seagate Technology support servicesInternet MySeagate Reseller.seagate.com Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call center Presales and Technical Support Warranty Service FAX services-All Europe toll callToll-free support numbers Asia/Pacific support services Publication feedback survey Momentus 5400.2 Blade Server Product Manual, Rev. B Index NumericsPage TMR Momentus 5400.2 Blade Server Product Manual, Rev. B Page Seagate Technology LLC