Seagate ST9500323CS manual Physical organization, Recording and interface technology, Seek time

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2.4Physical organization

	Drive model	Read/write heads	Number of discs

	ST9500323CS	4	2

	ST9320328CS	3
	ST9320328CS	3

	ST9250311CS	2	1

	ST91603110CS
	ST91603110CS

2.5Recording and interface technology

Interface	Serial ATA (SATA)

Recording method	Perpendicular

Recording density BPI (bits/inch avg)	1,490k

Track density TPI (tracks/inch avg)	265k

Areal density (Gbits/inch2 avg)	394
Spindle speed (RPM) (± 0.2%)	5,400

Maximum Internal transfer rate (Mbits/sec)	1,175

I/O data-transfer rate (Mbytes/sec max)	300 default / 150 available via Seagate specific SCT command

Interleave	1:1

Cache buffer	8 Mbytes (8,192 kbytes)

2.6Physical characteristics

Drive specification

Height	(mm)	9.5 +/-0.2
	(inches)	0.374	+/-0.0078

Width	(mm)	69.85	+/-0.25
	(inches)	2.75 +/-0.0098

Length	(mm)	100.35 +0.55 / -0.25
	(inches)	3.957	+0.079 / -0.0098

Weight (max)		110 grams
ST9500323CS, ST9320328CS,		0.243 pounds
ST9250311CS, ST91603110CS

2.7Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows:

•Track-to-track seek time is an average of all possible single-track seeks in both directions.

•Average seek time is a true statistical random average of at least 5,000 measurements of seeks between ran- dom tracks, less overhead.

Table 2: Typical seek times

Seek times (msec)

Read

6	Pipeline HD Mini Series SATA Product Manual, Rev. E

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Contents Pipeline HD Mini Series Sata ST9500323CSST9250311CS ST9320328CSST91603110CSRevision history Revision Date Sheets affected or commentsPipeline HD Mini Series Sata Product Manual, Rev. E Pipeline HD Mini Series Sata Product Manual, Rev. E Contents Pipeline HD Mini Series Sata Product Manual, Rev. E List of Figures Page Seagate Technology Support Services Viii Introduction About the Serial ATA interfacePage Drive specifications Specification summary tableSleep mode Default logical geometry LBA modeFormatted capacity Cylinders Read/write heads Sectors per track 16,383Physical characteristics Physical organizationRecording and interface technology Seek timePower specifications Start/stop timesDC power Typical current profilePower-management modes Power management modesActive mode Idle modeEnvironmental specifications Acoustics Electromagnetic immunity Test for Prominent Discrete Tones PDTsRadio frequency environments Performance Reference Test Description Level StandardSafety certification ReliabilityAgency certification Annualized Failure Rate AFREnvironmental protection Korean RRLAustralian C-Tick N176 FCC verificationEuropean Union Restriction of Hazardous Substances RoHS Corrosive environmentChina Restriction of Hazardous Substances RoHS Directive Pipeline HD Mini Series Sata Product Manual, Rev. E Configuring and mounting the drive Handling and static-discharge precautionsConfiguring the drive Serial ATA cables and connectorsDrive mounting Top cover stiffness/deflectionMeasurements shown in are in inches Pipeline HD Mini Series Sata Product Manual, Rev. E Serial ATA connector pin definitions SignalSerial ATA Sata interface Segment Pin Function DefinitionPower Supported ATA commandsCommand name Command code in hex ATA-standard commands Command name Command code in hex ATA-standard power-management commands ATA-standard security commandsIdentify Device command Word Description ValueXxxxH 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 Pipeline HD Mini Series Sata Product Manual, Rev. E Index ITE TPI Pipeline HD Mini Series Sata Product Manual, Rev. E Page Seagate Technology LLC