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Constellation Serial ATA Product Manual, Rev. D 9
3.5 Physical characteristics
Weight: (maximum)
ST9500530NS 196 grams (0.43 lbs)
ST9160511NS 188 grams (0.41 lbs)
Cache buffer 32 Mbytes (32,768 kbytes)
Note. Refer to Figure 5, page 23 for detailed mounting configuration dimensions.
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 avera
ge of at least 5,000 measurements of seeks between
random tracks, less overhead.
*Typical seek times (msec) Read Write
Track-to-track 0.5 0.7
Average 8.0 8.4
Full Stroke 17.4 17.9
Average latency: 4.16
*Measured in performance mode.
Note. Th
ese 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
ST9500530NS ST9160511NS
Power-on to Ready (sec) 20 (max)
Standby to Ready (sec) 6 (max) 4 (max)
Ready to spindle stop (sec) 20 (max)