Seagate ST360020ACE, ST320410ACE, ST380020ACE, ST340810ACE manual Seek time, Start/stop times

U Series CE Family Product Manual, Rev. A 7

1.5 Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The spec- ifications 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 5,000 measurements of seeks between random tracks, less overhead.

•Full-stroke seek time is one-half the time needed to seek from the first data cylinder to the maximum data cylinder and back to the first data cylinder. The full-stroke typical value is determined by averaging 100 full-stroke seeks in both directions.

Typical seek times (msec)	Read	Write
Track-to-track	1.2	2.0
Average	9.9	10.9
Full-stroke	22.0	24.0
Average latency: 5.55 msec	—	—

Note. These drives are designed to consistently meet the seek times rep- resented in this manual. Physical seeks, regardless of mode (such as track-to-track and average) are expected to meet or exceed the noted values. However, due to the manner in which these drives are format- ted, benchmark tests that include command overhead or measure logical seeks may produce results that vary from these specifications.

1.6 Start/stop times

Power-on to Ready (sec)	6.5 (typical)
Standby to Ready (sec)	6.5 (typical)
Ready to spindle stop (sec)	10 (typical)