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Barracuda LP Series SATA Product Manual, Rev. A 7
2.4 Physical characteristics
2.5 Access time
Access time measurements are taken with nominal power at 25°C ambient temperature. All times are mea-
sured using drive diagnostics. The specifications in the table below are defined as follows:
• Track-to-track access time is an average of all possible single-track seeks in both directions.
• Average access 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.
2.6 Start/stop times
ST32000542AS and ST31500541AS ST31000520AS
Maximum height 26.1 mm (1.028 inches)
Maximum width 101.85 mm (4.010 inches)
Maximum length 146.99 mm (5.787 inches)
Typical weight 655 grams (1.444 lb.) 622 grams (1.371lb.)
Cache buffer 32 Mbytes (16,384 kbytes)
Typical access times (msec) Read Write
Track-to-track <1.0 <1.2
Average <16.0 <16.0
2000 and 1500 GB models 1000 GB models
Power-on to Ready (sec) <13.0 (typical) <8.0 (typical)
Standby to Ready (sec) <8.0 (typical) <6.0 (typical)
Ready to spindle stop (sec) 10 (max)