Power-Management Modes - Seagate BARRACUDA COMPUTE ST4000DMZ04 Product Manual

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:
Power modes Heads
Active Tracking
Idle, Active Floating
Idle, Low Power Parked
Standby Parked
Sleep Parked
• 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.
Seagate BarraCuda Product Manual, Rev. J
Spindle Electronics
Rotating Full Power
Rotating Partial Power
Rotating Partial Power
Stopped Low Power
Stopped Low Power
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