Seagate ST9120315AS ユーザーズマニュアル

M

OMENTUS 

5400.6 SATA P

RODUCT 

M

ANUAL

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EV

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The drive provides programmable power management to provide greater energy efficiency. In most systems, you can control 
power management through the system setup program. The drive features the following power-management modes:

The drive is in Active mode during the read/write and seek operations.

The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disc access is 
necessary.

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 in Self Refresh 

Low Power mode, 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.

The drive enters Sleep mode after receiving a Sleep command from the host.

 

In Sleep mode, the drive buffer is in Self 

Refresh 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 with 
all current translation parameters intact.

Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and begins count-
ing 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.

Active (operating)

Tracking

Rotating

Full power

Idle, performance

Tracking

Rotating

Self refresh—low power

Idle, active

Floating

Rotating

Self refresh—low power

Idle, low power

Parked

Rotating

Self refresh—low power

Standby

Parked

Stopped

Self refresh—low power

Sleep

Parked

Stopped

Self refresh—low power