Seagate ST9120826A Manual Do Utilizador

12

Momentus 5400 FDE Product Manual, Rev. C

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 in performance mode, 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 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.

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