Barracuda ATA IV Family Product Manual, Rev. B 7
1.4 Physical characteristics
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.
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.
Drive specification
ST380021A, ST360021A,
ST340016A, ST320011A
Maximum height (mm)
(inches)
26.1
1.028
Maximum width (mm)
(inches)
101.8
4.01
Maximum length (mm)
(inches)
147.0
5.787
Typical weight (grams)
(pounds)
635
1.40
Typical seek times (msec) Read Write
Track-to-track 0.95 0.76
Average
1 disc
2 disc
9.0
9.5
10.0
10.5
Average latency: 4.16 4.16
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