Seagate ST9120821SB, ST98823SB Seek time, Typical seek times, Time to ready Typical Max @ 25C

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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 random tracks, less overhead.

Table 2:	Typical seek times

Typical seek times (msec)		Read	Write

Track-to-track		1.0	1.5

Average		12.5	14.5

Full-stroke		22.0	24.0

Average latency		5.56	5.56

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 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 specifications.

2.8Time to ready

Time to ready	Typical	Max @ 25°C

Power-on to Ready (sec)	3.5	8.0

Standby to Ready (sec)	3.0	8.0

Momentus 5400.2 SATA Blade Server Product Manual, Rev. B

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Contents

ST9120821SB ST9100824SB ST98823SB ST96812SB ST94813SB Momentus 5400.2 SataPage Contents Momentus 5400.2 Sata Blade Server Product Manual, Rev. B List of Figures Page Momentus 5400.2 Sata disc drive IntroductionAbout the Serial ATA interface Specification summary table Drive specificationsLoad/Unload U/UL cycles 25C, 50% relative humidity LBA mode Default logical geometryFormatted capacity Cylinders Read/write heads Sectors per track 16,383Drive specification Physical characteristicsPhysical organization Recording and interface technologyTime to ready Seek timeTypical seek times Typical seek times msec Read WritePower specifications Additional details Deferred spinupEnvironmental specifications Operating shock ShockNonoperating shock VibrationElectromagnetic immunity AcousticsDrive level acoustics Radio frequency environmentsMeasurement type Specification Safety certificationReliability Agency certificationAustralian C-Tick N176 Korean RRLFCC verification Corrosive environment Environmental protectionEuropean Union Restriction of Hazardous Substances RoHS Momentus 5400.2 Sata Blade Server Product Manual, Rev. B Handling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveDrive mounting Mounting dimensions-top, side and end viewMomentus 5400.2 Sata Blade Server Product Manual, Rev. B Signal Serial ATA connector pin definitionsSerial ATA Sata interface Segment Pin Function DefinitionP10 Ground 2nd mate P11 Reserved Pin Function DefinitionCommand name Command code in hex ATA-standard commands Supported ATA commandsATA-standard security commands Command name Command code in hexMomentus 5400.2 Sata Blade Server Product Manual, Rev. B Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit WordSet Features command values Set Features commandA.R.T. commands 3 S.M.A.R.T. commandsCode in features register A.R.T. command Internet Seagate Technology support servicesPresales Support Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index ITE Sata Momentus 5400.2 Sata Blade Server Product Manual, Rev. B Page Seagate Technology LLC