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8 Momentus Product Manual, Rev. B
3.7 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 5000 measurements of seeks between
random tracks, less overhead.
Table 2: Typical seek times
Typical seek times (ms) Read
Track-to-track 1.5
Average 11.0
Full-stroke (ST9750423AS, ST9750423ASG, ST9640424AS,
ST9640423AS and ST9640423ASG models only)
27.0
Full-stroke (all other models) 22.0
Average latency (ST9750423AS, ST9750423ASG, ST9640424AS,
ST
9640423AS and ST9640423ASG models only)
5.6
Average latency (all other models) 4.2
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.
3.8 Start/stop times
ST9750423AS, ST9750423ASG,
ST9640424AS, ST9640423AS
and ST9640423ASG,
ST9750422AS, ST9750420AS,
ST9750420ASG, ST9500424AS,
ST9500423AS and ST9500423ASG
Time to ready Typical
Max @ 25
°C
Typical
Max @ 25°C
Power-on to Ready (sec) 3.6 5.1 4.0 5.5
Standby to Ready (sec) 2.5 4.0 3.0 4.5