Bedienungsanleitung Seagate Barracuda 7200.7 Serial ATA (Seite 19 von 54) (Englisch)

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Barracuda 7200.7 Serial ATA Product Manual, Rev. N 11

2.8.5 Power-management modes

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:

• 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 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.

• Sleep mode

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.

• 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 commands and returns to Active mode when disc access is necessary.

2.9 Environmental specifications

2.9.1 Ambient temperature

Ambient temperature is defined as the temperature of the environment immediately surrounding the drive.

Actual drive case temperature should not exceed 69°C (156°F) within the operating ambient conditions for

standard models, or 64°C (147°F) within the operating ambient conditions for ST3200822AS model. Recom-

mended measurement locations are shown in See Figure 5 on page 22 .

Above 1,000 feet (305 meters), the maximum temperature is derated linearly to 112°F (44°C) at 10,000 feet

(3,048 meters).

Operating 0° to 60°C (32° to 140°F) for standard models

5° to 55°C (41° to 131°F) for ST3200822AS model

Nonoperating –40° to 70°C (–40° to 158°F)

Power modes Heads Spindle Buffer

Active Tracking Rotating Enabled

Idle Tracking Rotating Enabled

Standby Parked Stopped Enabled

Sleep Parked Stopped Disabled

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