Seagate ST940814AM, ST940813AM manual Power-management modes, Active mode, Idle mode, Sleep mode

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2.9.4Power-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:

Power modes

Heads

Spindle

Buffer

 

 

 

 

Active (operating)

Tracking

Rotating

Enabled

 

 

 

 

Idle, performance

Tracking

Rotating

Enabled

 

 

 

 

Idle, active

Floating

Rotating

Disabled

 

 

 

 

Idle, low power

Parked

Rotating

Disabled

 

 

 

 

Standby

Parked

Stopped

Disabled

 

 

 

 

Sleep

Parked

Stopped

Disabled

 

 

 

 

•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.

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Contents EE25 Series Page Contents EE25 Series Product Manual, Rev. E List of Figures EE25 Series Product Manual, Rev. E Introduction EE25 Series Product Manual, Rev. E Specification summary Drive specificationsAftermarket Specifications for 40 and 30 Gbyte modelsVibration, nonoperating Drive specification ST920813AM ST920814AM Specifications for 20 Gbyte modelsEE25 Series Product Manual, Rev. E Physical organization Default logical geometryLBA mode Formatted capacitySeek time Physical characteristicsTechnology Specification Recording and interface technology85C 25C 20C 30C Read seek times vs temperature 85C 25C 20C 30CStart/stop times Msec Typical MaxPower specifications Conducted noise Typical current profileVoltage tolerance Sleep mode Power-management modesActive mode Idle modeAltitude Environmental specificationsOperating shock ShockNonoperating shock Operating vibration Acoustic mode Idle Normal Seek Performance SeekAcoustics VibrationTest Description Performance Reference Level Standard Measurement type SpecificationElectromagnetic immunity ReliabilityAgency certification Corrosive environment Environmental protectionEuropean Union Restriction of Hazardous Substances RoHS Page Master/slave configuration Configuring and mounting the driveHandling and static discharge precautions Jumper settingsCable-select option Drive mountingATA interface ATA interface signals and connector pinsSignal Name Connector Cable Contact Conductor Cable Connector Signal Name Conductor ContactCommand name Command code in hex ATA-standard commands Supported ATA commandsATA-standard power-management commands Command name Command code in hexATA-standard security commands Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit Word0CH Set Features commandEE25 Series Product Manual, Rev. E Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage Page EE25 Series Product Manual, Rev. E Page Seagate Technology LLC
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