Seagate ST920814AM, ST940813AM, ST940814AM, ST930814AM, ST930813AM manual Set Features command, 0CH

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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:

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.

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Contents EE25 Series Page Contents EE25 Series Product Manual, Rev. E List of Figures EE25 Series Product Manual, Rev. E Introduction EE25 Series Product Manual, Rev. E Specification summary Drive specificationsAftermarket Specifications for 40 and 30 Gbyte modelsVibration, nonoperating Drive specification ST920813AM ST920814AM Specifications for 20 Gbyte modelsEE25 Series Product Manual, Rev. E Physical organization Default logical geometryLBA mode Formatted capacitySeek time Physical characteristicsTechnology Specification Recording and interface technology85C 25C 20C 30C Read seek times vs temperature 85C 25C 20C 30CStart/stop times Msec Typical MaxPower specifications Voltage tolerance Typical current profileConducted noise Sleep mode Power-management modesActive mode Idle modeAltitude Environmental specificationsNonoperating shock ShockOperating shock Operating vibration Acoustic mode Idle Normal Seek Performance SeekAcoustics VibrationTest Description Performance Reference Level Standard Measurement type SpecificationElectromagnetic immunity ReliabilityAgency certification European Union Restriction of Hazardous Substances RoHS Environmental protectionCorrosive environment Page Master/slave configuration Configuring and mounting the driveHandling and static discharge precautions Jumper settingsCable-select option Drive mountingATA interface ATA interface signals and connector pinsSignal Name Connector Cable Contact Conductor Cable Connector Signal Name Conductor ContactCommand name Command code in hex ATA-standard commands Supported ATA commandsATA-standard security commands Command name Command code in hexATA-standard power-management commands Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit Word0CH Set Features commandEE25 Series Product Manual, Rev. E Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexPage Page EE25 Series Product Manual, Rev. E Page Seagate Technology LLC