Seagate ST340015ACE manual Set Features command, 0CH

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36	Barracuda 5400.1 Product Manual, Rev. G

4.1.3Set Features command

This command (EFH) 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 (default)
	0BH	PIO mode 3
	0CH	PIO mode 4
	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).

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Contents Page Page Page Page Contents Seagate Technology support services Barracuda 5400.1 Product Manual, Rev. GList of Figures Barracuda 5400.1 Product Manual, Rev. G Introduction Barracuda 5400.1 Product Manual, Rev. G Drive specifications Specification summary tableDrive specification ST340015ACE 50,000 Humidity SeaShield Physical organization Default logical geometryLBA mode Physical characteristics ATAPower specifications Seek timeStart/stop times Typical seek times msec Read WriteBarracuda 5400.1 Product Manual, Rev. G Power consumption Spinup powerSeek mode Read/write power and currentBarracuda 5400.1 Product Manual, Rev. G Typical 5V startup and operation current profile Power-management modes Active modeIdle mode Conducted noiseEnvironmental specifications Ambient temperature Sleep modeIdle and Standby timers Temperature gradient Wet bulb temperatureHumidity Relative humidity AltitudeBarracuda 5400.1 Product Manual, Rev. G Shock Operating shockNonoperating shock VibrationAcoustic mode AcousticsFluid Dynamic Bearing FDB motor acoustics Model Idle Quiet seek Performance seekReliability Performance Reference Test Description Level StandardKorean RRL Agency certification Safety certificationElectromagnetic compatibility FCC verification Barracuda 5400.1 Product Manual, Rev. G Configuring and mounting the drive Handling and static discharge precautionsBreather filter hole precautions Breather filter hole locationDrive as master with a non-ATA-compatible slave Cable select optionUltra ATA/100 cable Drive mountingMaster SlaveMounting dimensions-top, side and end view Barracuda 5400.1 Product Manual, Rev. G ATA interface signals and connector pins ATA interfaceO pins and supported ATA signals Command name Command code in hex ATA-standard commands EC HCommand name Command code in hex Identify Device command ATA-standard security commandsWord Description Value 0C5AHXxxxH Xx3FH Description if bit is set to Bit Set Features command 0CHF1H Report full capacity available 4 S.M.A.R.T. commands Code in features Register A.R.T. commandSeagate Technology support services Online Services Internet MySeagateAutomated Phone Services 40Barracuda 5400.1 Product Manual, Rev. GUSA/Canada/Latin America Support Services European Support Services Africa/Middle East Support ServicesAsia/Pacific Support Services Barracuda 5400.1 Product Manual, Rev. G Index GMR Barracuda 5400.1 Product Manual, Rev. G 48Barracuda 5400.1 Product Manual, Rev. G Page Seagate Technology LLC

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