Seagate ST9051A, Руководство по установке

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Idle and standby timers. Default time delays for both the Idle
timer and the Standby timer are set by the drive at power-on.
These delays can also be specified by the user via the system
Setup utility.
Each time the drive performs an Active function (read, write or
seek) the Idle timer is re-initialized, and begins the countdown
from the specified delay time to zero. If the Idle timer reaches zero
before any drive activity is required, the drive transitions into Idle
mode. Upon transitioning to Idle mode, the drive begins the
Standby timer countdown. If the Standby timer reaches zero
before any drive activity is required, the drive transitions into
Standby mode. In both Idle and Standby mode the drive accepts
all commands, and returns to Active mode when disc access is
necessary.
ST9052A, ST9077A, ST9096A, and ST9144A
power management mode descriptions
Active mode. The drive is in Active mode during the read/write
and seek operations.
Idle mode. At power-on the drive sets the Idle timer to enter Idle
mode after 5 seconds of inactivity. The Idle timer delay can also
be set by the user via the system Setup utility. In Idle mode the
spindle remains up to speed. The heads are parked and latched
away from the data zones for maximum data integrity. The drive
accepts all commands, and returns to Active mode when disc
access is necessary.
ST9144 Family Installation Guide, Rev. B 13