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Western Digital Hard Disk Drive OEM Specification
11.52 Standby (E2h/96h)
Command Block Output Registers
Command Block Input Registers
Table 243 Standby Command (E2h/96h)
The Standby command causes the device to enter the Standby Mode immediately, and set auto power down timeout
parameter (standby timer).
When the Standby mode is entered, the drive is spun down but the interface remains active. If the drive is already
spun down, the spin down sequence is not executed.
During the Standby mode the device will respond to commands, but there is a delay while waiting for the spindle to
reach operating speed.
The automatic power down sequence is enabled and the timer starts counting down when the drive returns to Idle
mode.
If the EPC feature set is enabled, device enters into the Standby_Z power condition.
Output Parameters To The Device
Timeout Parameter. If zero, the timeout interval (Standby Timer) is NOT disabled. If non-zero,
then the automatic power down sequence is enabled, and the timeout interval is shown blow:
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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.
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