Hitachi HDS723020BLA642 Specifications page 138

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.
If zero, then the automatic power down sequence is disabled. If
Hitachi hard disk drive specifications
138
Value Description
---------- -------------------------
0 Timer disabled
1-240 Value * 5
241-251 (Value-240) * 30 minutes
252 21 minutes
253 8 hours
254 Aborted
255 21 minutes 15 seconds