Seagate ST360020ACE, ST320410ACE, ST380020ACE, ST340810ACE manual Seek time, Start/stop times

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U Series CE Family Product Manual, Rev. A

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1.5 Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The spec- ifications 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.

•Full-stroke seek time is one-half the time needed to seek from the first data cylinder to the maximum data cylinder and back to the first data cylinder. The full-stroke typical value is determined by averaging 100 full-stroke seeks in both directions.

Typical seek times (msec)	Read	Write


Track-to-track	1.2	2.0

Average	9.9	10.9

Full-stroke	22.0	24.0

Average latency: 5.55 msec	—	—

Note. These drives are designed to consistently meet the seek times rep- resented 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 format- ted, benchmark tests that include command overhead or measure logical seeks may produce results that vary from these specifications.

1.6 Start/stop times

Power-on to Ready (sec)	6.5 (typical)
Standby to Ready (sec)	6.5 (typical)
Ready to spindle stop (sec)	10 (typical)

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Contents Series CE Family Page Series CE Family Page Contents ATA interface Configuring and mounting the driveFigures Series CE Family Product Manual, Rev. a Introduction Specification summary table Track-to-track seek Time msec typical Altitude meters be Low mean sea level Default logical geometry LBA ModeFormatted capacity Physical characteristics Physical organizationRecording and interface technology Start/stop times Seek timePower consumption Power specificationsTypical current profile Power Mode Typical Watts Typical Amps Means 12VPower-management modes Conducted noiseVoltage tolerance Idle and Standby timers Environmental tolerances Ambient temperatureTemperature gradient Sleep modeShock 3.2 Wet bulb temperatureHumidity 3.1 Relative Humidity AltitudeOperating vibration Nonoperating vibrationDrive acoustics Agency certification 1.12.1 Safety certification Electromagnetic immunityReliability Electromagnetic compatibility Taiwan BsmiKorean RRL Australian C-Tick N176 FCC verificationHandling and static-discharge precautions Configuring and mounting the driveJumper settings Master/slave configuration Drive as master with a non-ATA-compatible slaveOptions jumper block Cable-select option Alternate capacity jumperUltra ATA/100 cable Drive mounting Recommended Case temperature Measurement locationATA interface ATA interface signals and connector pinsO pins and supported ATA signals Command name Command code in hex ATA-standard commands Supported ATA commandsATA-standard security commands Identify Drive commandCommand name ATA-standard power-management commands0C5AH Word DescriptionXx07H Word Description ValueXx3FH Bit Word Description if bit is set to Bit WordSet Features command 0AH Code in Features A.R.T. Command Register 4 S.M.A.R.T. commandsSeries CE Family Product Manual, Rev. a Series CE Family Product Manual, Rev. a Series CE Family Product Manual, Rev. a Series CE Family Product Manual, Rev. a Series CE Family Product Manual, Rev. a