10
ST1.2 Series Product Manual, Rev. B
2.7.4
Power-management modes
The drive provides programmable power management to provide greater energy efficiency. The drive features
the following power-management modes:
• Active mode
The drive is in Active mode during the read/write and seek operations.
• Low power idle mode
Drive enters Low Power Idle mode from Active Idle mode when the Advanced Power Management Level is
set above 80h and the Idle timer is reached at 2 seconds. Disc is spinning and head is parked and drive accepts
all commands and returns to Active mode any time disc access is necessary.
• Performance idle mode
The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disc
access is necessary.
• Standby/Sleep mode
The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the
standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a
specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby
mode, the
drive buffer is disabled, the heads are parked and the spindle is at rest. The drive accepts all
commands and returns to Active mode any time disc access is necessary.
• Standby timers
Each time the drive performs an Active function (such as read, write or seek), the standby timer is reinitialized
and begins counting down from its specified delay times to zero. If the standby timer reaches zero before any
drive activity is required, the drive makes a transition to Standby mode. In both Idle and Standby mode, the
drive accepts all commands and returns to Active mode when disc access is necessary.
Table 3:
Power-management modes
Power modes
Heads
Spindle
Buffer
Active (operating)
Tracking
Rotating
Enabled
Idle, low power
Parked
Rotating
Disabled
Standby/Sleep
Parked
Stopped
Disabled
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