Seagate BarraCuda Product Manual, Rev. A

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Drive Specifications

2.8.3 Voltage tolerance

Voltage tolerance (including noise):

•5V ±5%

• 12V +10% / -7.5%

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

•Sleep mode

The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the drive buffer is dis-

abled, 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 trans-

lation parameters intact.

• Idle and Standby timers

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 com-

mands and returns to Active mode when disk access is necessary.

Power modes

Heads

Spindle

Buffer

Active

Tracking

Rotating

Enabled

Idle

Tracking

Rotating

Enabled

Standby

Parked

Stopped

Enabled

Sleep

Parked

Stopped

Disabled