Seagate ST1000NC000, ST1000NC001, ST2000NC001, ST2000NC000 Extended Power Conditions PowerChoiceTM

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2.8.4.1Extended Power Conditions - PowerChoiceTM

Utilizing the load/unload architecture a programmable power management interface is provided to tailor systems for reduced power consumption and performance requirements.

The table below lists the supported power conditions available in PowerChoice. Power conditions are ordered from highest power consumption (and shortest recovery time) to lowest power consumption (and longest recovery time) as follows: Idle_a power >= Idle_b power >= Idle_c power >= Standby_z power. The further you go down in the table, the more power savings is actualized. For example, Idle_b results in greater power savings than the Idle_a power condition. Standby results in the greatest power savings.

Power Condition Name

Power Condition ID

Description

 

 

 

Idle_a

81H

Reduced electronics

 

 

 

Idle_b

81H

Heads unloaded. Disks spinning at full RPM

 

 

 

Idle_c

81H

Heads unloaded. Disks spinning at reduced RPM

 

 

 

Standby_z

00H

Heads unloaded. Motor stopped (disks not spinning)

 

 

 

Each power condition has a set of current, saved and default settings. Default settings are not modifiable. Default and saved settings persist across power-on resets. The current settings do not persist across power-on resets. At the time of manufacture, the default, saved and current settings are in the Power Conditions log match.

PowerChoice is invoked using one of two methods

•Automatic power transitions which are triggered by expiration of individual power condition timers. These timer values may be customized and enabled using the Extended Power Conditions (EPC) feature set using the standardized Set Features command interface.

•Immediate host commanded power transitions may be initiated using an EPC Set Features "Go to Power Condition" subcommand to enter any supported power condition. Legacy power commands Standby Immediate and Idle Immediate also provide a method to directly transition the drive into supported power conditions.

PowerChoice exits power saving states under the following conditions

•Any command which requires the drive to enter the PM0: Active state (media access)

•Power on reset

PowerChoice provides the following reporting methods for tracking purposes

Check Power Mode Command

• Reports the current power state of the drive Identify Device Command

•EPC Feature set supported flag

•EPC Feature enabled flag is set if at least one Idle power condition timer is enabled

Power Condition Log reports the following for each power condition

•Nominal recovery time from the power condition to active

•If the power condition is Supported, Changeable, and Savable

•Default enabled state, and timer value

•Saved enabled state, and timer value

•Current enabled state, and timer value

S.M.A.R.T. Read Data Reports

•Attribute 192 - Emergency Retract Count

•Attribute 193 - Load/Unload Cycle Count

Constellation CS Serial ATA Product Manual, Rev. C

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Contents ConstellationCS Serial ATA Revision Date Description of Change Document Revision HistoryContents Sata Interface Figures Seagate Technology Support Services Introduction About the Sata interface Specification summary tables Drive SpecificationsFormatted capacity Model Formatted capacity Guaranteed sectors Bytes per sectorLBA mode LBA modeDefault logical geometry Physical characteristicsStart/stop times Power specificationsPower consumption Seek timePeak operating current sequential write 3TB Drive DC power requirementsTypical current profiles 3TB model current profile 2TB model current profile 1TB model current profile Voltage tolerance Conducted noisePower modes Heads Spindle Buffer Power-management modesPower Condition Name Power Condition ID Description Extended Power Conditions PowerChoiceTMPowerChoice is invoked using one of two methods Power Condition Power Condition Name Identifiers Power Condition Name Manufacturer Default Timer ValuesEPC Subcommands Descriptions PowerChoice Supported Extended Power Condition IndentifiersOperating Ambient temperatureEnvironmental limits HumidityNon-operating AltitudeShock VibrationTest for Prominent Discrete Tones PDTs AcousticsElectromagnetic immunity Electromagnetic compatibility Agency certification Safety certificationKorean RRL FCC verificationAustralian C-Tick N176 Corrosive environment Product warrantyEnvironmental protection China Restriction of Hazardous Substances RoHS DirectiveStorage ShippingProduct repair and return information Configuring the drive Handling and static-discharge precautionsSata cables and connectors Drive mounting Mounting dimensionsData encryption Power requirementsATA Security Erase Unit Command on SED Sata drives Sanitize Feature Set on SED DrivesHot-Plug compatibility Sata InterfaceSata connector pin definitions Sata device plug connector pin definitionsCommand name Command code in hex Supported ATA commandsF1H Word Description Value Identify Device command69-74 Bit WordSmart error login is supported 0CH Set Features commandCode in features register A.R.T. command 3 S.M.A.R.T. commandsConstellation CS Serial ATA Product Manual, Rev. C IndexConstellation CS Serial ATA Product Manual, Rev. C Constellation CS Serial ATA Product Manual, Rev. C Americas Seagate Technology LLC
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