Functional Specifications; Seek Time - Seagate ST5660A Product Manual

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1.2 Functional specifications

Interface
Zone Bit Recording method
External data burst transfer rate
(Mbytes per sec)
Internal data transfer rate
(Mbits per sec)
Spindle speed (RPM)
Cache size (Kbytes)
Read/write heads
Discs
Bytes per sector
Recording density, max (BPI)
Track density (TPI)
* This is the external transfer rate using PIO mode 3 timing.
** This is the external transfer rate using multiword DMA mode 1 timing.

1.2.1 Seek time

Seek time is measured under nominal conditions of temperature and
voltage with the drive mounted horizontally. Seek time is a true statistical
average of at least 5,000 seeks.
Track-to-track seek time is the average of all possible single-track seeks
in both directions. Average seek time is measured by executing seeks in
both directions between random cylinders. Full-stroke seek time is half
the time needed to seek from track 0 to the maximum track and back to
track 0.
Host overhead varies between systems and cannot be specified. Drive
internal overhead is measured by issuing a no-motion seek and is
typically less than 0.5 msec.
Track-to-track Average/Typ
seek time seek time
3.5 msec typ 12.0 msec read
4.0 msec max 14.0 msec write
ST5660A Product Manual, Rev. A
AT (IDE)
RLL (1,7)
11.1*
13**
27 to 48
4,500 ± 0.5%
256
4
2
512
68,000
3,309
Full-stroke seek Average
time latency
6.67 msec
25.0 msec max