U4 Family Product Manual, Rev. D 7
•Average seek time is a true statistical random average of at le ast 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 th e fi rst dat a
cylinder. The full-stroke typical value is determined by averaging 100
full-stroke seeks in both directions.
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 times1.7 Power specifications
The drive receives DC power (+5V or +12V) through a four-pin st andard
drive power connector.
1.7.1 Power consumption
Power requirements for the drives are listed in the table on page 9.
Typical power measurements are based on an average of drives tested,
under nominal conditions, using 5.0V input voltage at 25°C ambient
temperature.
•Spinup power
Spinup power is measured from the time of power-on to the time that
the drive spindle reaches operating speed.
Typical seek times (msec) Read Write
Track-to-track 2.0 2.75
Average 10.5 11.5
Full-stroke 24.0 26.0
Average latency: 5.56 msec — —
Power-on to Ready (sec) 8 (typical)
Standby to Ready (sec) 7 (typical)
Ready to spindle stop (sec) 10 (typical)