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Video 3.5 HDD Product Manual, Rev. J 11
2.5 Physical characteristics
1000GB model 500, 320, 250 and 160GB models
Maximum height 26.1mm / 1.028 in 20.20mm / 0.794 in
Maximum width 101.85mm / 4.010 in
Maximum length 146.99mm / 5.787 in
Typical weight 615g / 1.356 lb 500 and 320GB models
420g / 0.926 lb
250 and 160GB models
395g / 0.871 lb
Cache buffer
ST31000424CS, ST3500414CS, ST3320413CS and
ST3250412CS
ST31000322CS, ST3500312CS, ST3320311CS,
ST3250312CS and ST3160316CS
16MB (16,384KB)
8MB (8,192KB)
2.6 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) Read Write
Track-to-track <1.0 <1.2
Average <14.0 <15.0
*Measured in performance mode.
**Measured in quiet 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.
2.7 Start/stop times
Start/stop times (s) 1000GB models
500, 320, 250 and 160GB models
Power-on to Ready (typical) <12.0 <6.0
Standby to Ready (typical) <12.0 <6.0
Ready to spindle stop (max.) 10