Computer Drive User Manual

DiamondMax 22 Serial ATA Product Manual, Rev. A 9
2.4 Physical characteristics
2.5 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.
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.
Maximum height (1000 GB models) 26.1 mm (1.028 inches)
Maximum height (320-160 GB models) 20.17 mm (0.794 inches)
Maximum width 101.6 mm (4.000 +/- 0.010 inches)
Maximum length 146.99 mm (5.787 inches)
Typical weight
1000 GB models 630 grams (1.389 lbs)
320 GB models 405 grams (0.893 lbs)
160 GB models 390 grams (0.860 lbs)
Cache buffer
STM31000334AS 32 Mbytes (32,768 kbytes)
STM3320614AS 16 Mbytes (16,384 kbytes)
STM3160813AS 8 Mbytes (8,192 kbytes)
Typical seek times (msec) Read Write
Track-to-track (1000, 320 and 160 GB models) <0.8 <1.0
Average (1000 GB model) <8.5 <10.0
Average (320 and 160 GB models) <11.0 <12.0
Average latency: 4.16