Seagate ST31000424CS, ST3250312CS, 100529372 Physical characteristics, Seek time, Start/stop times

2.5	Physical characteristics
		1000GB model		500, 320, 250 and 160GB models
Maximum height		26.1mm / 1.028 in		20.20mm / 0.794 in
Maximum width			101.85mm / 4.010 in
Maximum length			146.99mm / 5.787 in
Typical weight		615g / 1.356 lb		500 and 320GB models
				420g / 0.926 lb
				250 and 160GB models
				395g / 0.871 lb
Cache buffer
ST31000424CS, ST3500414CS, ST3320413CS and			16MB (16,384KB)
	ST3250412CS
	ST31000322CS, ST3500312CS, ST3320311CS,		8MB (8,192KB)
	ST3250312CS and ST3160316CS

2.6Seek 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	<1.0	<1.2
Average	<14.0	<15.0

*Measured in performance mode. **Measured in quiet 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.

2.7Start/stop times

Start/stop times (s)	1000GB models	500, 320, 250 and 160GB models
Power-on to Ready (typical)	<12.0	<6.0
Standby to Ready (typical)	<12.0	<6.0
Ready to spindle stop (max.)	10

Video 3.5 HDD Product Manual, Rev. J 11