Power Mode; Power Management Commands; Standby Timer; Interface Capability For Power Modes - IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive Specifications

2. Idle command
3. Idle Immediate command
4. Sleep command
5. Standby command
6. Standby Immediate command

10.5.1 Power Mode

The lowest power consumption when the device is powered on occurs in Sleep Mode. When in sleep mode,
the device requires a reset to be activated.
In Standby Mode the device interface is capable of accepting commands, but as the media may not imme-
diately accessible, there is a delay while waiting for the spindle to reach operating speed.
In Idle Mode the device is capable of responding immediately to media access requests.
In Active Mode the device is under executing a command or accessing the disk media with read look-ahead
function or write cache function.

10.5.2 Power Management Commands

The Check Power Mode command allows a host to determine if a device is currently in, going to or leaving
standby mode.
The Idle and Idle Immediate commands move a device to idle mode immediately from the active or standby
modes. The idle command also sets the standby timer count and starts the standby timer.
The Standby and Standby Immediate commands move a device to standby mode immediately from the
active or idle modes. The standby command also sets the standby timer count.
The Sleep command moves a device to sleep mode. The device's interface becomes inactive at the com-
pletion of the sleep command. A reset is required to move a device out of sleep mode. When a device exits
sleep mode it will enter Standby mode.

10.5.3 Standby timer

The standby timer provides a method for the device to automatically enter standby mode from either active
or idle mode following a host programmed period of inactivity. If the device is in the active or idle mode,
the device waits for the specified time period and if no command is received, the device automatically enters
the standby mode.
If the value of SECTOR C O U N T register on Idle command or Standby command is set to 00h, the standby
timer is disabled.

10.5.4 Interface Capability for Power Modes

The each power mode affects the physical interface as defined in the following table:
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O E M Specifications for DTTA-3xxxxx