Set Features command, 0CH | Seagate ST3500830ACE, ST3250820ACE

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
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 indi- cated above.

DB35.3 Series PATA Product Manual, Rev. C

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Seagate ST3500830ACE, ST3250820ACE, ST3320820ACE, ST3300820ACE, ST3750840ACE, ST3400820ACE manual Set Features command, 0CH

Contents

DB35.3 Series Pata Page DB35.3 Series Pata Page Contents DB35.3 Series Pata Product Manual, Rev. C List of Figures DB35.3 Series Pata Product Manual, Rev. C Introduction DB35.3 Series Pata Product Manual, Rev. C Specification summary table Drive specifications Drive specification ST3750840ACE ST3500830ACE ST3400820ACE DB35.3 Series Pata Product Manual, Rev. C Drive specification ST3320820ACE ST3300820ACE ST3250820ACE DB35.3 Series Pata Product Manual, Rev. C LBA mode Default logical geometryFormatted capacity Cylinders Read/write heads Sectors per track 16,383 Drive specification Physical characteristicsRecording and interface technology 750GB 500GB 400GB 320GB 300GB 250GB Start/stop times Power specificationsSeek time DC power requirements Standby mode Conducted noise Typical current profile Active mode Power-management modesIdle mode Sleep mode Environmental specifications Operating shock ShockNonoperating shock Disc models 4 Disc models Idle CE seek profile AcousticsFluid Dynamic Bearing FDB motor acoustics Electromagnetic immunity Safety certificationReliability Agency certification Korean RRL Electromagnetic compatibilityAustralian C-Tick N176 FCC verification European Union Restriction of Hazardous Substances RoHS Environmental protectionCorrosive environment DB35.3 Series Pata Product Manual, Rev. C Handling and static discharge precautions Configuring and mounting the drive Breather filter hole location Breather filter hole precautions Master/slave configuration Jumper settingsDrive as master with a non-ATA-compatible slave Cable-select option Ultra ATA/100 cable Drive mounting Mounting dimensions-top, side and end view DB35.3 Series Pata Product Manual, Rev. C Pins and supported ATA signals ATA interface signals and connector pins Command name Command code in hex Supported ATA commands F4H Word Description Value Identify Device command Xx07H Bit Word Description if bit is set to Bit Word 0CH Set Features command Code in features Register A.R.T. command 4 S.M.A.R.T. commands Internet MySeagate Spp.seagate.com Warranty ServicePresales Support Technical Support Data Recovery Services Data Recovery Services Authorized Service Centers Toll-free support numbers FAX services-All Europe toll callCall center Presales and Technical Support Warranty Service Asia/Pacific support services Index Page Page DB35.3 Series Pata Product Manual, Rev. C Page Seagate Technology LLC