Hitachi CinemaStar P7K500 Specifications page 154

Output Parameters To The Device
Sector Count Timeout Parameter.
non-zero, then the automatic power down sequence is enabled, and the timeout interval is
shown below:
When the automatic power down sequence is enabled, the drive will enter Standby mode
automatically if the timeout interval expires with no drive access from the host. The timeout
interval will be reinitialized if there is a drive access before the timeout interval expires.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
If zero, then the automatic power down sequence is disabled. If
Value
----------
1-240
241-251
252
253
254
255
146
Timeout
-------------------------
0 Timer disabled
Value * 5
(Value-240) * 30 minutes
21 minutes
8 hours
21 minutes 10 seconds
21 minutes 15 seconds