Seagate SkyHawk Product Manual, Rev. B
12
Drive Specifications
2.3
Default logical geometry
•
Cylinders
: 16,383
•
Read/write heads
: 16
•
Sectors per track
: 63
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to
n–1,
where
n
is
the
number of guaranteed sectors as defined above
.
2.4
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.
2.5
Start/stop times
The start/stop times listed below are for all models.
Time-to-ready may be longer than normal if the drive power is removed without going through normal OS powerdown
procedures.
Typical seek times (ms)
Read
Write
Track-to-track
1.0
1.2
Average (1TB - 4TB models)
<12.0
<12.0
Average (6TB and 8TB models)
8.5
9.5
Average latency (1TB - 4TB models)
5.1
Average latency (6TB and 8TB models)
4.0
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.
8TB models
6TB models
2TB, 3TB and
4TB models
1TB models
Power-on to ready (in seconds)
30 (max)
23 (typical)
/ 30 (max)
15 (typical) / 17 (max)
<6 (max)
Standby to ready (in seconds)
30 (max)
15 (typical) / 17 (max)
<6 (max)
Ready to spindle stop (in seconds)
12 (max)
23 (max)
10 (typical) / 11 (max)
