Voltage Tolerance; Power-Management Modes - Seagate BARRACUDA ST8000DM004 Product Manual

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2.7.3 Voltage tolerance

Voltage tolerance (including noise):
• 5V ±5%
• 12V ±10%

2.7.4 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:
Power modes Heads
Active Tracking
Idle, Performance Tracking
Idle, Active Floating
Idle, Low Power Parked
Standby Parked
Sleep Parked
• Active mode
The drive is in Active mode during the read/write and seek operations.
• Idle mode
The electronics remain powered, and the drive accepts all commands and returns to Active mode when disk
access is necessary.
• Standby mode
The drive enters Standby mode immediately when the host sends a Standby Immediate command. If the
host has set the standby timer, the drive enters Standby mode automatically after the drive has been inac-
tive for a specifiable length of time. The standby timer delay is established using a Standby or Idle com-
mand. In Standby mode, the electronics are in low power mode, the heads are parked and the spindle is at
rest. The drive accepts all commands and returns to Active mode when disk access is necessary.
• Sleep mode
The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the electronics
are in 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.
• 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 disk access is necessary.
Seagate BarraCuda Product Manual, Rev. D
Spindle Electronics
Rotating Full Power
Rotating Full Power
Rotating Partial Power
Rotating Partial Power
Stopped Low Power
Stopped Low Power
Drive Specifications
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