Seagate BarraCuda Product Manual, Rev. A

11

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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 and 500GB

20.17mm / 0.794 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 and 500GB

400g / 0.88lb

Cache buffer

3TB, 2TB and 1TB

64MB

500GB

32MB

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.