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

Models: ST940813AM ST920814AM ST920813AM ST940814AM ST930813AM ST930814AM

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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.

EE25 Series Product Manual, Rev. E

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Seagate ST920814AM, ST940813AM, ST940814AM, ST930814AM, ST930813AM, ST920813AM manual Set Features command, 0CH

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 specifications Aftermarket Specifications for 40 and 30 Gbyte models Vibration, nonoperating Drive specification ST920813AM ST920814AM Specifications for 20 Gbyte models EE25 Series Product Manual, Rev. E Physical organization Default logical geometryLBA mode Formatted capacity Seek time Physical characteristicsTechnology Specification Recording and interface technology 85C 25C 20C 30C Read seek times vs temperature 85C 25C 20C 30CStart/stop times Msec Typical Max Power specifications Voltage tolerance Typical current profileConducted noise Sleep mode Power-management modesActive mode Idle mode Altitude Environmental specifications Nonoperating shock ShockOperating shock Operating vibration Acoustic mode Idle Normal Seek Performance SeekAcoustics Vibration Test Description Performance Reference Level Standard Measurement type SpecificationElectromagnetic immunity Reliability Agency 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 settings Cable-select option Drive mounting ATA interface ATA interface signals and connector pinsSignal Name Connector Cable Contact Conductor Cable Connector Signal Name Conductor Contact Command name Command code in hex ATA-standard commands Supported ATA commands ATA-standard security commands Command name Command code in hexATA-standard power-management commands Word Description Value Identify Device command Xx07H Bit Word Description if bit is set to Bit Word 0CH Set Features command EE25 Series Product Manual, Rev. E Technical Support Seagate Technology support servicesInternet Presales Support Data 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