Physical Characteristics; Seek Time - Seagate Barracuda Product Manual

Drive Specifications

2.5 Physical characteristics

Maximum height
3TB, 2TB and 1.5TB
1TB and 750GB
500GB, 320GB, 250GB
Maximum width (all models)
Maximum length (all models)
Typical weight
3TB and 2TB
1.5TB
1TB and 750GB
500GB, 320GB, 250GB
Cache buffer

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.
Typical seek times (ms)
Track-to-track
Average
Average latency
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
3TB, 2TB, 1.5TB, 1TB, 750GB
500GB, 320GB and 250GB
Read
1.0
8.5
26.1mm / 1.028 in
20.17mm / 0.7825 in
19.98mm / 0.787 in
101.6mm / 4.0 in ( ± 0.010 in)
146.99mm / 5.787 in
626g / 1.38 lb
535g / 1.18 lb
400g / 0.88 lb
415g / 0.92 lb
64MB (64,768kb)
16MB (16,384kb)
Write
1.2
9.5
4.16
Barracuda SATA Product Manual, Rev. G
www.seagate.com