Seagate ST3120213SCE, ST3160212SCE, ST3250824SCE, ST3200827SCE 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 8: 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.

34	DB35.2 Serial ATA Product Manual, Rev. C

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Contents DB35.2 Serial ATA Page Contents DB35.2 Serial ATA Product Manual, Rev. C List of Figures Page Introduction About the Serial ATA interface Drive specifications Specification summariesDrive specifications for 500 and 400 Gbyte models Drive specification ST3500841SCE ST3400833SCEBe asked to provide the drive serial number, model number or Drive specifications for 300, 250 and 200 Gbyte models Drive specification ST3300822SCE ST3250824SCE ST3200827SCEDrive specifications for 300, 250 and 200 Gbyte models Drive specifications for 160, 120, and 80 Gbyte models Drive specification ST3160212SCE ST3120213SCE ST3802110SCEDrive specifications for 160, 120, and 80 Gbyte models Default logical geometry LBA modeFormatted capacity Recording and interface technologyDB35.2 Serial ATA Product Manual, Rev. C Physical characteristics Drive specificationSeek time Typical seek times msec Read WritePower specifications Start/stop timesDC power requirements Typical current profilesPower-management modes Active modeIdle mode Sleep modeEnvironmental specifications Acoustics Nonoperating shockVibration Operating vibrationElectromagnetic immunity ReliabilityRadio frequency environments Performance Reference Test Description Level StandardSafety certification Agency certificationElectromagnetic compatibility Korean RRLEnvironmental protection Australian C-Tick N176FCC verification European Union Restriction of Hazardous Substances RoHSCorrosive environment DB35.2 Serial ATA Product Manual, Rev. C Configuring and mounting the drive Handling and static-discharge precautionsBreather filter hole precautions Breather filter hole locationConfiguring the drive Serial ATA cables and connectorsMounting dimensions-top, side and end view Drive mountingSerial ATA Sata interface Hot-Plug compatibilitySerial ATA device plug connector pin definitions Serial ATA connector pin definitionsSignal 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 valuesA.R.T. commands 3 S.M.A.R.T. commandsCode in features register A.R.T. command DB35.2 Serial ATA Product Manual, Rev. C Presales Support InternetTechnical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index Pcba Sata Page Page Seagate Technology LLC