Seagate ST3250820SCE ユーザーズマニュアル

DB35.3 Series Serial ATA Product Manual, Rev. D

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

• Standby 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 enabled, 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 disabled, 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.