Seagate ST4000 ユーザーズマニュアル

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. 

The start/stop times listed below.

Time-to-ready may be longer than normal if the drive power is removed without going through normal OS powerdown 
procedures. 

26.11mm / 1.028 in

101.6mm / 4.0 in (± 0.010 in)

146.99mm / 5.787 in

780g / 1.72 lb

610g / 1.35 lb

128MB

64MB

Track-to-track

1.0

1.2

1.0

1.2

Average

8.5

9.5

12.0

12.0

Average latency

4.0

5.1

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.

Power-on to ready
(in seconds)

23 (typical)

30 (max)

15 (typical)

18 (max)

Standby to ready 
(in seconds)

23 (typical)

30 (max)

15 (typical)

18 (max)

Ready to spindle stop
(in seconds)

23 (max)

11 (max)