Seagate Desktop HDD Product Manual, Rev. C (Draft 3)
9
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.
2.7
Start/stop times
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.
Maximum height
26.11mm / 1.028 in
Maximum width
101.6mm / 4.0 in (± 0.010 in)
Maximum length
146.99mm / 5.787 in
Typical weight
8TB, 6TB & 5TB
780g / 1.72 lb
4TB
610g / 1.35 lb
Cache buffer
8TB
256MB
6TB & 5TB
128MB
4TB
64MB
Models
ST8000DM002, ST6000DM001,
ST5000DM002
ST4000DM000
Typical seek times (ms)
Read
Write
Read
Write
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
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.
Models
ST8000DM002
ST6000DM001,
ST5000DM002
ST4000DM000
Power-on to ready
(in seconds)
25 (max)
23 (typical)
30 (max)
15 (typical)
18 (max)
Standby to ready
(in seconds)
30 (max)
23 (typical)
30 (max)
15 (typical)
18 (max)
Ready to spindle stop
(in seconds)
12 (max)
23 (max)
11 (max)
