Hitachi HUS103036FL3800 - Manual (Page 17)

Drawing No. Sheet No. Revision
K6610091 17/43 2005/2/23
4.3.2 Spindle Start Selection
When multiple disk drives are connected to the same power supply and turned on
simultaneously, a large current will be required at power up.
In the above case, it is recommended to turn the motors on one by one at intervals
in order to minimize 12V line current.
This can be done according to the following 3 jumper pin configurations in the case
of NW drive:
1. If Disable Auto Start mode is set (C3:9-10 installed);
(1) Use a spindle start command for each drive, issuing it to the next drive after
receiving the previous drive’s Ready condition.
or
(2) Use the spindle start command for each drive, issuing it at intervals of more
than 10 seconds.
2. If Enable Auto Start mode is set (C3:9-10 removed) and Spindle Start at Power
On is set (C3:13-14 removed);
Manually power on drives at intervals of more than 10 seconds.
3. If Enable Auto Start mode is set (C3:9-10 removed) and Delayed Start is set
(C3:13-14 installed);
Upon power on condition, the drives will automatically spin up in 10 second
intervals according to their SCSI ID. (The drive with the lowest SCSI ID will start
first.)
In the case that their SCSI ID are more than 7, the drives will automatically spin up
in 10 second intervals according to the numbers of (SCSI ID minus 8).
Note 1 The Delayed Start setting and the Auto Start setting can be done by
commands from host via SCSI bus connector (C1) in the case of NC drive.