Seagate ST38421A Formatted capacity, Default logical geometry, Physical organization, LBA Mode

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U4 Family Product Manual, Rev. D

5

1.0 Drive specifications

Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate the U4 ST38421A, ST36421A, ST34311A and the ST32112A.

1.1 Formatted capacity

Drive Model	Guaranteed Mbytes	Guaranteed	Bytes per
	(1 Mbyte = 106 bytes)	sectors	sector


ST38421A	8,440	16,498,944	512

ST36421A	6,448	12,596,850	512

ST34311A	4,320	8,452,080	512

ST32112A	2,160	4,225,536	512

1.1.1 Default logical geometry

CHS Mode	Cylinders	Read/Write heads	Sectors per track


ST38421A	16,368	16	63

ST36421A	13,330	15	63

ST34311A	8,944	15	63

ST32112A	4,192	16	63

LBA Mode

When addressing either drive in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,where n is the number of guaranteed sectors as defined above.

1.2 Physical organization

Drive Model	Read/Write heads (MR)	Number of discs


ST38421A	4	2

ST36421A	3	2

ST34311A	2	1

ST32112A	1	1

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Contents Product Manual Page Product Manual Page Contents ATA interface Configuring and mounting the driveSeagate Connfidential Review Draft not for Distribution FiguresSeagate Confidential Review Draft not for Distribution Introduction Specification summary table Track-to-track seek time Msec typical Vibration, nonoperating LBA Mode Default logical geometryFormatted capacity Physical organizationDrive Specification ST38421A, ST36421A ST34311A, ST32112A Physical characteristicsRecording and interface technology Seek timePower consumption Power specificationsSpinup power Start/stop timesRead/Write power and current Seek ModeOperating power and current Idle mode powerTypical current profile Power Mode Typical Watts Typical Amps RMS 12VCurrent amps Time seconds Conducted noise Power-management modesVoltage tolerance Temperature gradient Environmental tolerances Ambient temperatureHumidity Relative HumidityAltitude Wet bulb temperatureShock Operating shockNonoperating vibration Operating vibrationDrive acoustics Electromagnetic susceptibility Agency certification Safety certificationReliability Electromagnetic compatibilityAustralian C-Tick FCC verificationU4 Family Product Manual, Rev. D Handling and static-discharge precautions Configuring and mounting the driveMaster/slave jumper settings Jumper settings Master/slave configurationCable-select option Important mounting precautionsUltra ATA/66 cable Drive mountingMounting dimensions-top, side and end view ATA interface ATA interface signals and connector pinsO pins and supported ATA signals Command name Command code in hex ATA-standard commands ATA Interface commands Supported ATA commandsCommand name Identify Drive commandATA-standard power-management commands ATA-standard security commandsWord Description 27-46 Drive model number 40 Ascii char Multiword DMA active and modes Description if bit is set to Bit Word 0CH Set Features commandCode in Features Register A.R.T. Command 4 S.M.A.R.T. commandsPage U4 Family Product Manual, Rev. D U4 Family Product Manual, Rev. D

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