Seagate BarraCuda Product Manual, Rev. H
12
2.8.4
Power-management modes
The drive provides programmable power management to provide greater energy efficiency. In most systems, users can control power management
through the system setup program. The drive features the following power-management modes:
• Active mode
The drive is in Active mode during the read/write and seek operations.
• Idle mode
The electronics remain powered, and the drive accepts all commands and returns to Active mode when disk access is necessary.
• Standby mode
The drive enters Standby mode immediately when the host sends a Standby Immediate command. If the host has set the standby
timer, the drive enters 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 electronics are in low power mode, the heads are
parked and the spindle is at rest. The drive accepts all commands and returns to Active mode when disk access is necessary.
• Sleep mode
The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the electronics are in low power mode,
the heads are parked and the spindle is at rest. The drive leaves Sleep mode after it receives a Hard Reset or Soft Reset from the host.
After receiving a reset, the drive exits Sleep mode and enters Standby mode.
Power modes
Heads
Spindle
Electronics
Active
Tracking
Rotating
Full Power
Idle, Active
Floating
Rotating
Partial Power
Idle, Low Power
Parked
Rotating
Partial Power
Standby
Parked Stopped
Low
Power
Sleep
Parked
Stopped
Low Power
