Seagate ST9250611NS, ST9500622NS manual Physical characteristics, Seek time, Start/stop times

3.5Physical characteristics

Maximum height	14.8 mm (0.583 in)
Maximum width	70.0 mm (2.76 in)
Maximum length	100.5 mm (3.957 in)
Max weight
1TB models	200 g (0.441 lb)
500GB models	183 g (0.403 lb)
250GB models	179 g (0.395 lb)
Cache buffer	64 Mbytes (65,536 KB)

3.6Seek 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	0.7	0.85
Average	8.5	9.5
Full Stroke	16.96	17.96
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.

3.7Start/stop times

Power-on to Ready (sec)	20 (max)
Standby to Ready (sec)	13 (max)
Ready to spindle stop (sec)	20 (max)

8 Constellation.2 Serial ATA Product Manual, Rev. B