Seagate ST1500DM003, STBD3000100, STBD2000101, ST1000DM003 manual Physical characteristics, Seek time

Drive Specificationswww.seagate.com

2.5 Physical characteristics

Maximum height
3TB, 2TB and 1.5TB	26.1mm / 1.028 in
1TB and 750GB	20.17mm / 0.7825 in
500GB, 320GB, 250GB	19.98mm / 0.787 in
Maximum width (all models)	101.6mm / 4.0 in ( ± 0.010 in)
Maximum length (all models)	146.99mm / 5.787 in
Typical weight
3TB and 2TB	626g / 1.38 lb
1.5TB	535g / 1.18 lb
1TB and 750GB	400g / 0.88 lb
500GB, 320GB, 250GB	415g / 0.92 lb
Cache buffer
3TB, 2TB, 1.5TB, 1TB, 750GB	64MB (64,768kb)
500GB, 320GB and 250GB	16MB (16,384kb)

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 5000 measurements of seeks between random tracks, less overhead.

Typical seek times (ms)	Read		Write
Track-to-track	1.0		1.2
Average	8.5		9.5
Average latency		4.16

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, Note 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.

16 Barracuda SATA Product Manual, Rev. G