Start/Stop Time; Typical Power-Up And Power-Down Sequence; Power-Up Sequence; Power-Down Sequence - Seagate ST3655 Series Product Manual

4 ST3655 Family AT Drives Product Manual, Rev. A

1.4 Start/stop time

Within 20 seconds after DC power is applied, the drive is ready. Within
15 seconds after DC power is removed, the drive spindle stops rotating.

1.5 Typical power-up and power-down sequence

The typical power-up and power-down sequences assist you in evaluat-
ing the drive's performance; they are not performance specifications.

1.5.1 Power-up sequence

1. Power is applied to the drive.
2. When power is applied, the LED is on for about 1 second.
3. The spindle motor reaches operating speed in about 4 seconds.
4. The arm-lock solenoid releases the arm, making an audible sound.
5. The drive performs velocity adjustment seeks.
6. The heads are positioned over track 0 and the drive is ready.

1.5.2 Power-down sequence

Caution. Do not move the drive until the motor has come to a complete
stop.
1. The power is turned off.
2. Within 3 seconds, the motor begins to spin down.
3. The read/write heads automatically move to the shipping zone, which
is inside the maximum data cylinder.
4. The arm-lock solenoid locks the arm, making an audible sound. This
completes the power-down sequence.

1.5.3 Auto-park

Upon power-down, the read/write heads automatically move to the
shipping zone. The heads park inside the maximum data cylinder and
the arm-lock solenoid engages, making an audible sound. When power
is applied, the heads recalibrate to track 0.