Seagate ST2000NC001, ST1000NC001, ST1000NC000, ST2000NC000, ST3000NC002 Set Features command, 0CH

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5.3.2Set 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 interrupt. 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
	46H	Ultra DMA mode 6
10H	Enable use of SATA features
55H	Disable read look-ahead (read cache) feature.
82H	Disable write cache
90H	Disable use of SATA features
AAH	Enable read look-ahead (read cache) feature (default).
F1H	Report full capacity available

At power-on, or after a hardware or software reset, the default values of the features are as indicated

Note above.

Constellation CS Serial ATA Product Manual, Rev. C

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Contents ConstellationCS Serial ATA Document Revision History Revision Date Description of ChangeContents Sata Interface Figures Seagate Technology Support Services Introduction About the Sata interface Drive Specifications Specification summary tablesModel Formatted capacity Guaranteed sectors Bytes per sector Formatted capacityPhysical characteristics LBA modeDefault logical geometry LBA modeSeek time Power specificationsPower consumption Start/stop times3TB Drive DC power requirements Peak operating current sequential writeTypical current profiles 3TB model current profile 2TB model current profile 1TB model current profile Conducted noise Voltage tolerancePower-management modes Power modes Heads Spindle BufferPowerChoice is invoked using one of two methods Extended Power Conditions PowerChoiceTMPower Condition Name Power Condition ID Description PowerChoice Supported Extended Power Condition Indentifiers Power Condition Name Manufacturer Default Timer ValuesEPC Subcommands Descriptions Power Condition Power Condition Name IdentifiersHumidity Ambient temperatureEnvironmental limits OperatingVibration AltitudeShock Non-operatingElectromagnetic immunity AcousticsTest for Prominent Discrete Tones PDTs Agency certification Safety certification Electromagnetic compatibilityAustralian C-Tick N176 FCC verificationKorean RRL China Restriction of Hazardous Substances RoHS Directive Product warrantyEnvironmental protection Corrosive environmentProduct repair and return information ShippingStorage Sata cables and connectors Handling and static-discharge precautionsConfiguring the drive Mounting dimensions Drive mountingSanitize Feature Set on SED Drives Power requirementsATA Security Erase Unit Command on SED Sata drives Data encryptionSata Interface Hot-Plug compatibilitySata device plug connector pin definitions Sata connector pin definitionsSupported ATA commands Command name Command code in hexF1H Identify Device command Word Description ValueBit Word 69-74Smart error login is supported Set Features command 0CH3 S.M.A.R.T. commands Code in features register A.R.T. commandIndex Constellation CS Serial ATA Product Manual, Rev. CConstellation CS Serial ATA Product Manual, Rev. C Constellation CS Serial ATA Product Manual, Rev. C Seagate Technology LLC Americas