Operation Manual

Seagate Desktop HDD Product Manual, Rev. Y 13
www.seagate.com Drive Specifications
2.5 Physical characteristics
2.6 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.
Maximum height
3TB and 2TB 26.1mm / 1.028 in
1TB, 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 626g / 1.38 lb
2TB
626g / 1.38 lb - or -
535g / 1.18 lb
1TB, 500GB, 320GB and 250GB 415g / 0.915 lb
Cache buffer
3TB, 2TB 64MB (64,768kB)
1TB 64MB (64,768kB) / 32MB (32,768kB)
500GB, 320GB and 250GB 16MB (16,384kB)
Typical seek times (ms) Read Write
Track-to-track 1.0 1.2
Average 8.5 9.5
Average latency 4.16
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.