Seagate ST92014A, ST94019A, ST93015A manual 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 8:			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 indi- cated above.

Momentus 42 Product Manual, Rev. A

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Contents Momentus Page Momentus Page Revision Date Sheets Affected Revision status summary sheetRev. a 05/03/2004 All Page Contents Momentus 42 Product Manual, Rev. a List of Figures Viii Momentus 42 Product Manual, Rev. a Momentus 42 disc drive IntroductionMomentus 42 Product Manual, Rev. a Drive specification ST94019A ST93015A ST92014A Drive specificationsSpecification summary SpecificationsSpecifications Physical organization Default logical geometryLBA mode Formatted capacityRecording and interface technology Physical characteristicsTechnology Specification Time to ready Typical Max Seek timeTime to ready Typical seek times msec Read WritePower specifications Voltage tolerance Typical current profileConducted noise Idle mode Power-management modesPower management modes Active modeEnvironmental specifications Vibration ShockOperating shock Nonoperating shockElectromagnetic immunity AcousticsElectromagnetic immunity Drive level acousticsAgency certification Safety certificationMeasurement type Specification ReliabilityFCC verification Korean RRLAustralian C-Tick N176 Momentus 42 Product Manual, Rev. a Master/slave configuration Configuring and mounting the driveHandling and static discharge precautions Jumper settingsCable-select option Drive mountingCable Connector Conductor Contact Signal Name ATA interface signals and connector pinsConnector signals Connector Cable Signal Name Contact ConductorCommand name Command code in hex ATA-standard commands Supported ATA commandsSupported commands ATA-standard security commands Command name Command code in hexATA-standard power-management commands Word Description Value Identify Device commandXxxxH Description if bit is set to Bit Features register values Set Features commandCode in features register A.R.T. command 4 S.M.A.R.T. commandsSupported S.M.A.R.T. commands Technical Support Seagate Technology support servicesInternet MySeagate Reseller.seagate.com Presales SupportAuthorized Service Centers Warranty ServiceCall Center Toll-free Direct dial FAX / Internet Call Center Toll-free Direct dialAmericas +1-405-324-47301 +1-405-324-4704 Americas SEAGATE2 +1-405-324-47003 +1-405-324-4702Toll-Free Support Numbers FAX Services-All Europe toll callCall Center Presales and Technical Support Warranty Service Asia/Pacific Support Services Momentus 42 Product Manual, Rev. a Numerics IndexPage Page Momentus 42 Product Manual, Rev. a Page Seagate Technology LLC