Barracuda 7200.10 Serial ATA Product Manual, Rev. K
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2.6
Seek 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.
*Measured in performance mode.
**Measured in quiet mode.
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.
2.7
Start/stop times
750 - 300 GB models*, ST3250620AS,
ST3250820AS and 200 GB model
ST3250410AS and ST3250310AS*
and 160 - 40 GB models**
Typical seek times (msec)
Read
Write
Read
Write
Track-to-track
<0.8
<1.0
<0.8
<1.0
Average
<8.5
<10.0
<11.0
<12.0
Average latency:
4.16
750 - 320 GB
models
300 GB model
ST3250620AS, ST3250820AS
and 200 GB model
ST3250410AS, ST3250310AS
and 160 - 40 GB models
Power-on to Ready (sec)
15 (max)
11 (max)
7.9 (max)
Standby to Ready (sec)
15 (max)
11 (max)
7.9 (max)
Ready to spindle stop (sec)
10 (max)
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