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U Series CE Family Product Manual, Rev. A
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)
Track-to-track
Average
Full-stroke
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)
Standby to Ready (sec)
Ready to spindle stop (sec)
Read
Write
1.2
2.0
9.9
10.9
22.0
24.0
—
—
6.5 (typical)
6.5 (typical)
10 (typical)
7
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