ST9144 Family Installation Guide, Rev. B | 13 |
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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.
