Seagate ST3120026AS, ST3120827AS manual Physical organization, Recording and interface technology

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2.4	Physical organization

Drive model		Read/write heads	Number of discs

ST3200822AS, ST3160827AS, ST3160023AS and ST3160021AS		4	2

ST3120827AS, ST3120026AS and ST3120022AS		3	2

ST380817AS, ST380013AS and ST380011AS		2	1

ST340111AS and ST340014AS		1	1

2.5	Recording and interface technology

Interface		Serial ATA (SATA)

Recording method		16/17 EPRML

Recording density BPI (bits/inch max)		595,000 (671,500 on ST3200822AS model)

Track density TPI (tracks/inch max)		94,600 (98,000 on ST3200822AS model)

Areal density (Gbits/inch2 max)		56.3 (68.5 on ST3200822AS model)
Spindle speed (RPM) (± 0.2%)		7,200

Maximum Internal transfer rate (Mbytes/sec)		85.4

Sustained transfer rate OD (Mbytes/sec max)		58

I/O data-transfer rate (Mbytes/sec max)		150 (SATA 1.0)

Interleave		1:1

Cache buffer
ST3200822AS, ST3160827AS, ST3160023AS, ST3120827AS,		8 Mbytes
ST3120026AS, ST380817AS, ST380013AS and ST340111AS
ST3160021AS, ST3120022AS, ST380011AS, and ST340014AS		2 Mbytes

2.5.1Physical characteristics

Drive specification

Maximum height
(mm)	26.035
(inches)	1.028

Maximum width
(mm)	101.6
(inches)	4.00

Maximum length
(mm)	146.99
(inches)	5.787

Typical weight
(grams)	635
(pounds)	1.4

6	Barracuda 7200.7 Serial ATA Product Manual, Rev. N

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Contents Barracuda 7200.7 Serial ATA Page Barracuda 7200.7 Serial ATA Page Contents Barracuda 7200.7 Serial ATA Product Manual, Rev. N List of Figures Page Introduction Native Command Queuing About the Serial ATA interfaceDrive specifications Specification summary tableSystem will display the warranty information for your drive Formatted capacity Default logical geometryLBA mode Cylinders Read/write heads Sectors per track 16,383Physical organization Physical characteristicsDrive specification Recording and interface technologyStart/stop times Power specificationsSeek time Standby mode Operating power and currentIdle mode power Typical current profiles Deferred spinupVoltage tolerance Additional detailsConducted noise Environmental specifications Humidity Relative humidity Temperature gradientWet bulb temperature AltitudeOperating vibration AcousticsVibration Nonoperating vibrationRadio frequency environments Electromagnetic immunityReliability Test Description Performance level Reference standardElectromagnetic compatibility Safety certificationAgency certification Korean RRLAustralian C-Tick N176 FCC verificationEuropean Union Restriction of Hazardous Substances RoHS Environmental protectionCorrosive environment Barracuda 7200.7 Serial ATA Product Manual, Rev. N Configuring and mounting the drive Handling and static-discharge precautionsConfiguring the drive Serial ATA cables and connectorsDrive mounting Mounting dimensions-top, side and end view Serial ATA Sata interface Hot-Plug compatibilitySignal Serial ATA device plug connector pin definitionsSerial ATA connector pin definitions Pin Function DefinitionPage Supported ATA commands Command name Command code in hex ATA-standard commandsATA-standard security commands Command name Command code in hexATA-standard power-management commands Identify Device command Word Description ValueXxxxH Fffeh Description if bit is set to Bit Word Bit WordSet Features command Set Features command valuesCode in features register A.R.T. command 3 S.M.A.R.T. commandsM.A.R.T. commands Barracuda 7200.7 Serial ATA Product Manual, Rev. N Technical Support Internet MySeagate Reseller.seagate.comPresales Support Data Recovery Services Warranty ServiceData 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 Publication feedback survey Barracuda 7200.7 Serial ATA Product Manual, Rev. N Index Mtbf RPM RRL Page Page Seagate Technology LLC