Start And Stop Times; Typical Power-Up And Power-Down Sequence; Power-Up Sequence - Seagate Medalist SL Product Manual

8 Medalist SL Family Product Manual, June 1996
The specifications in the table below are defined as follows:
• 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.
Track-to-track Average/typical
seek time seek time
2.0 msec typ 10.5 msec
Note. Host overhead varies between systems and cannot be specified.
Drive internal overhead is measured by issuing a no-motion seek.
Overhead is typically less than 1.0 msec.

1.5 Start and stop times

The drive is ready within 8 seconds after the power is applied. The drive
spindle stops rotating within 7 seconds typical after the power is re-
moved.

1.6 Typical power-up and power-down sequence

A typical power-up and power-down sequence is described below to
assist you in evaluating the drive. It is not a specification.

1.6.1 Power-up sequence

1. Power is applied to the drive.
2. After a delay, the startup current is applied and the spindle begins to
turn.
3. The accelerating current is applied, causing the spindle speed to
increase.
4. The spindle speed is close to the final correct value. The drive begins
to lock in speed-control circuits.
5. The arm-lock mechanism releases the arm.
6. The final speed control lock is achieved.
7. The heads are positioned over track 0 and the drive has completed
its power-up sequence.
Full-stroke Average
seek time latency
20.0 msec typ 5.58 msec