Seagate ST3400820NS, ST3250820NS manual Power-management modes, Active mode, Idle mode, Sleep mode

Page 25

2.8.4Power-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	Tracking	Rotating	Enabled

Idle	Tracking	Rotating	Enabled

Standby	Parked	Stopped	Enabled

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.

Barracuda ES Serial ATA Product Manual, Rev. D

19

Image 25

Contents Barracuda ES Serial ATA Revision Date Revision historyContents Barracuda ES Serial ATA Product Manual, Rev. D List of Figures Page Introduction About the Serial ATA interface Specification summary tables Drive specificationsDrive specification ST3750640NS ST3750840NS Drive specifications summary for 750 Gbyte modelsBarracuda ES Serial ATA Product Manual, Rev. D Drive specification ST3500630NS ST3500830NS Drive specifications summary for 500 Gbyte modelsFollowing web Drive specification ST3400620NS ST3400820NS Drive specifications summary for 400 Gbyte modelsBarracuda ES Serial ATA Product Manual, Rev. D Drive specification ST3320620NS ST3320820NS Drive specifications summary for 320 Gbyte modelsBarracuda ES Serial ATA Product Manual, Rev. D Drive specification ST3250620NS ST3250820NS Drive specifications summary for 250 Gbyte modelsBarracuda ES Serial ATA Product Manual, Rev. D LBA mode Default logical geometryFormatted capacity Cylinders Read/write heads Sectors per track 16,383Recording and interface technology Physical characteristics750GB 500GB 400GB 320GB 250GB Start/stop times Seek timeTypical seek times msec Read Write Power specifications Conducted noise Typical current profilesVoltage tolerance Active mode Power-management modesIdle mode Sleep modeEnvironmental specifications Vibration AcousticsOperating vibration Nonoperating vibrationRadio frequency environments Electromagnetic immunityTest Description Performance level Reference standard Reliability Safety certificationAgency certification Electromagnetic compatibilityAustralian C-Tick N176 Korean RRLFCC verification Corrosive environment Environmental protectionChina Restriction of Hazardous Substances RoHS Directive Barracuda ES Serial ATA Product Manual, Rev. D Handling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveDrive mounting Mounting dimensions-top, side and end viewBarracuda ES Serial ATA Product Manual, Rev. D Hot-Plug compatibility Serial ATA Sata interfaceSerial ATA connector pin definitions Serial ATA device plug connector pin definitionsSignal Pin Function DefinitionSupported ATA commands Supported ATA commandsCommand name Command code in hex F4H Word Description Value Identify Device commandXx07H 128 Security status 0001H 129 Seagate-reserved Bit Word Description if bit is set to Bit WordSet Features command values Set Features commandM.A.R.T. commands 3 S.M.A.R.T. commandsCode in features register A.R.T. command Presales Support InternetTechnical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index ITE Page Barracuda ES Serial ATA Product Manual, Rev. D Page Disc Drive, Scotts Valley, California 95066-4544, USA

Related manuals

Manual 2 pages 35.8 Kb