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3.5
Physical characteristics
Maximum height
Maximum width
Maximum length
Max weight
1TB models
500GB models
250GB models
Cache buffer
3.6
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.
*Typical seek times (ms)
Track-to-track
Average
Full Stroke
Average latency:
*Measured in performance 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.
3.7
Start/stop times
Power-on to Ready (sec)
Standby to Ready (sec)
Ready to spindle stop (sec)
8
Read
0.7
8.5
16.96
4.16
20 (max)
13 (max)
20 (max)
Constellation.2 Serial ATA Product Manual, Rev. B
14.8 mm (0.583 in)
70.0 mm (2.76 in)
100.5 mm (3.957 in)
200 g (0.441 lb)
183 g (0.403 lb)
179 g (0.395 lb)
64 Mbytes (65,536 KB)
Write
0.85
9.5
17.96
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