Seagate ST3400632NS, ST3250823NS, ST3250623NS, ST3400832NS manual Set Features command values

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4.3.2Set 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 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: Set Features command 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
	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

Note. At power-on, or after a hardware or software reset, the default values of the features are as indi- cated above.

28	NL35 Series SATA Product Manual, Rev. B

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Contents NL35 Series Serial ATA ST3400832NS ST3400632NS ST3250823NS ST3250623NSPage Contents NL35 Series Sata Product Manual, Rev. B List of Figures Page Introduction NL35 Series Serial ATAAbout the Serial ATA interface Drive specifications Specification summary tablesSustained transfer rate OD Mbytes/sec Nonoperating Formatted capacity Default logical geometryLBA mode Cylinders Read/write heads Sectors per track 16,383Seek time Physical characteristicsRecording and interface technology Typical seek times msec Read WritePower specifications Start/stop timesDC power requirements Typical current profilesIdle mode Power-management modesActive mode Sleep modeEnvironmental specifications Acoustics Radio frequency environments Electromagnetic immunityReliability Test Description Performance level Reference standardElectromagnetic compatibility Safety certificationAgency certification Korean RRLAustralian C-Tick N176 Environmental protectionCorrosive environment FCC verificationPage Configuring and mounting the drive Handling and static-discharge precautionsConfiguring the drive Serial ATA cables and connectorsMounting dimensions-top, side and end view Drive mountingNL35 Series Sata Product Manual, Rev. B Serial ATA Sata interface Hot-Plug compatibilitySignal Serial ATA device plug connector pin definitionsSerial ATA connector pin definitions Pin Function DefinitionSupported ATA commands Supported ATA commandsCommand name Command code in hex F4H Identify Device command Word Description ValueXx07H Description if bit is set to Bit Word Bit WordSet Features command Set Features command values3.1 S.M.A.R.T. Command Transport SCT 3 S.M.A.R.T. commandsA.R.T. commands Code in features register A.R.T. commandNL35 Series Sata Product Manual, Rev. B Presales Support Seagate Technology support servicesInternet Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index ITE RPM Page Page Seagate Technology LLC