Power-Down Sequence; Auto-Park - Seagate ST3285N Product Manual

6 ST3655 Family SCSI Drives Product Manual, Rev. A
b. b. If a jumper is installed on pins 3 and 4 of the options jumper block,
the remote start option is enabled. The drive begins to spin up
when the host commands the motor to start.
3. Within 250 msec after power is applied, the drive responds to the Test
Unit Ready, Request Sense and Inquiry commands.
4. The drive begins to lock in speed control circuits.
5. The actuator-lock solenoid releases the actuator, producing an audi-
ble sound.
6. The spindle motor reaches operating speed in about 5 seconds. After
5 seconds, there are no speed variations.
7. The drive performs velocity adjustment seeks.
8. The drive loads RAM code from the disc. During RAM code loading,
the LED flashes for approximately 1 second.
9. The drive seeks track 0 and becomes ready.

1.10.2 Power-down sequence

The following typical power-down sequence is provided to assist in
evaluating drive performance. This information does not constitute a
specification or a performance guarantee.
1. The power cable is unplugged from the drive, or the drive is com-
manded to spin down.
2. Within 3 seconds after the motor begins to spin down, the actuator
lock engages, producing an audible sound.
3. The spindle stops within 15 seconds, whether the power cable is
unplugged from the drive or the drive receives the power-down
command.

1.10.3 Auto-park

Upon power-down, the read/write heads automatically move to the
shipping zone. The heads park inside the maximum data cylinder. When
power is applied, the heads recalibrate to track 0.
Caution. Do not move the drive until the spindle motor has come to a
complete stop, otherwise you may damage the drive.