Shock And Vibration; Start And Stop Time; Power-Up Sequence - Seagate ST3285N Product Manual

ST3655 Family SCSI Drives Product Manual, Rev. A

1.9 Shock and vibration

All shock and vibration specifications assume that the drive is mounted in a
recommended mounting configuration, as shown in Figure 9 on page 29.
Inputs are measured at the drive mounting screws. Shock measurements
are based on an 11 msec, half sine wave shock pulse, not to be repeated
more than twice per second.
Shock
5–22 Hz vibration
22–500 Hz vibration
During operating shock and vibration, there is no physical damage to the
drive or performance degradation. During nonoperating shock and vibra-
tion, the read/write heads are positioned in the shipping zone.

1.10 Start and stop time

If the motor start option is disabled, the drive becomes ready within
20 seconds after power is applied. If the motor start option is enabled,
the drive becomes ready within 20 seconds after it receives the Motor
Start command. The drive stops within 15 seconds, whether the drive is
commanded to spin down or power is removed.

1.10.1 Power-up sequence

The following typical power-up sequence is provided to assist in evalu-
ating drive performance. This information does not constitute a specifi-
cation or a performance guarantee.
1. Power is applied to the disc drive.
2. When power is applied, the LED is on for about 5 seconds. Either of
following two sequences can occur, depending on whether a jumper
is installed on pins 3 and 4 of the options jumper block shown in
Figure 7 on page 25.
a. If a jumper is not installed on pins 3 and 4 of the options jumper
block, the remote start option is not enabled. The drive begins to
spin up as soon as power is applied.
Operating Nonoperating
2 Gs 75 Gs
0.020-inch 0.020-inch
displacement displacement
0.50 Gs 4.00 Gs
5