Seagate ST930813AM manual Recording and interface technology, Physical characteristics, Seek time

Page 15

2.5Recording and interface technology

Technology	Specification

Interface	Parallel ATA

Recording density BPI	540.1k bits/inch typical

Track density TPI	119k tracks/inch typical

Areal density	64.3 Gbits/inch2 max
Spindle speed	5,400 RPM (± 0.2%)

Internal data-transfer rate	321.1 Mbits/sec max

I/O data transfer rate	100 Mbytes/sec max

Interleave	1:1

Cache buffer	8 Mbytes (8,192 kbytes)

2.6Physical characteristics

Height	(mm)	9.5 +/–0.2
	(inches)	0.374	+/–0.008

Width	(mm)	69.85	+/–0.25
	(inches)	2.750	+/–0.010

Length	(mm)	100.2	+/–0.25
	(inches)	3.945	+/–0.010

Typical weight	(grams)	100
	(pounds)	0.22

2.7Seek time

Seek measurements are taken with nominal power. All times are measured using drive diagnostics. The spec- ifications 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 random tracks, less overhead.

Note. These drives are designed to consistently meet the seek times represented in this manual. Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet or exceed the noted values. However, due to the manner in which these drives are formatted, benchmark tests that include command overhead or measure logical seeks may produce results that vary from these speci- fications.

EE25 Series Product Manual, Rev. E

9

Image 15

Contents EE25 Series Page Contents EE25 Series Product Manual, Rev. E List of Figures EE25 Series Product Manual, Rev. E Introduction EE25 Series Product Manual, Rev. E Specification summary Drive specificationsAftermarket Specifications for 40 and 30 Gbyte modelsVibration, nonoperating Drive specification ST920813AM ST920814AM Specifications for 20 Gbyte modelsEE25 Series Product Manual, Rev. E Physical organization Default logical geometryLBA mode Formatted capacitySeek time Physical characteristicsTechnology Specification Recording and interface technology85C 25C 20C 30C Read seek times vs temperature 85C 25C 20C 30CStart/stop times Msec Typical MaxPower specifications Typical current profile Conducted noiseVoltage tolerance Sleep mode Power-management modesActive mode Idle modeAltitude Environmental specificationsShock Operating shockNonoperating shock Operating vibration Acoustic mode Idle Normal Seek Performance SeekAcoustics VibrationTest Description Performance Reference Level Standard Measurement type SpecificationElectromagnetic immunity ReliabilityAgency certification Environmental protection Corrosive environmentEuropean Union Restriction of Hazardous Substances RoHS Page Master/slave configuration Configuring and mounting the driveHandling and static discharge precautions Jumper settingsCable-select option Drive mountingATA interface ATA interface signals and connector pinsSignal Name Connector Cable Contact Conductor Cable Connector Signal Name Conductor ContactCommand name Command code in hex ATA-standard commands Supported ATA commandsCommand name Command code in hex ATA-standard power-management commandsATA-standard security commands Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit Word0CH Set Features commandEE25 Series Product Manual, Rev. E Technical Support Seagate Technology support servicesInternet Presales SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage Page EE25 Series Product Manual, Rev. E Page Seagate Technology LLC