Constellation ES Serial ATA Product Manual, Rev. D 7
3.5 Physical characteristics
Maximum height 26.1mm (1.028 in)
Maximum width 101.6mm (4.000 +/- 0.010 in)
Maximum length 146.99mm (5.787 in)
Max weight
ST32000644NS 710g (1.565 lb)
ST31000524NS 640g (1.411 lb)
ST3500514NS 610g (1.345 lb)
Cache buffer
ST32000644NS
ST31000524NS and ST3500514NS
64MB (64,768KB)
32MB (32,768KB)
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 5000 measurements of seeks between
random tracks, less overhead.
*Typical seek times (ms) Read Write
Track-to-track 0.5 0.8
Average <8.5 <9.5
Average latency: 4.16
*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
2TB models 1TB models 500GB models
Power-on to Ready (sec) 15 (max) 10 (max) 7 (max)
Standby to Ready (sec) 15 (max) 10 (max) 7 (max)
Ready to spindle stop (sec) 20 (max)