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U Series CE Family Product Manual, Rev. A 7
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.
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
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 — —
Power-on to Ready (sec) 6.5 (typical)
Standby to Ready (sec) 6.5 (typical)
Ready to spindle stop (sec) 10 (typical)