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14
ST9144 Family Installation Guide, Rev. B
Standby mode. The drive enters Standby mode when a Standby
Immediate command is been received from the host. The drive
can also enter Standby mode after a specifiable length of time
has elapsed with the drive in Idle mode. The Standby timer is
system-dependent, and is usually established by the user with a
system utility such as Setup.
In Standby mode, the SeaCache buffer remains enabled, the
heads are parked and the spindle is at rest. The drive accepts all
commands, and returns to Active mode when disc access is
necessary.
Sleep mode. The drive enters Sleep mode when a Sleep Imme-
diate command is received from the host. The heads are parked
and the spindle is at rest. The drive leaves Sleep mode when a
hard or soft reset is sent from the host. After a soft reset is
received, the drive exits Sleep mode with all current emula-
tion/translation parameters intact.
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.
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