Seagate ST9600204SS, ST9600104SS, ST9450304SS, ST9450404SS manual Idle Read After Write

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8.7Idle Read After Write

Idle Read After Write (IRAW) utilizes idle time to verify the integrity of recently written data. During idle periods, no active system requests, the drive reads recently written data from the media and compares it to valid write command data resident in the drives data buffer. Any sectors that fail the comparison result in the invocation of a rewrite and auto-reallocation process. The process attempts to rewrite the data to the original location. If a verification of this rewrite fails, the sector is re-mapped to a spare location.

44	Savvio 10K.4 SAS Product Manual, Rev. A

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Contents ST9600204SSST9600104SS ST9450404SSST9450304SS Standard Models Self-Encrypting Drive ModelsRevision history Rev. a 12/15/09 Initial releaseContents Defect and error management InstallationAbout self-encrypting drives Interface requirementsSeagate Technology support services Savvio 10K.4 SAS Product Manual, Rev. a List of Figures Page Scope Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean KCCReference documents European Union Restriction of Hazardous Substances RoHSGeneral description Standard features Media descriptionPerformance ReliabilityFormatted capacities Programmable drive capacityFactory-installed options Performance characteristics Internal drive characteristicsSeek performance characteristics Access timeGeneral performance characteristics Start/stop timeCache operation Prefetch/multi-segmented cache controlCaching write data Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenanceMaximum processing delay Fully-enabled delay 4 S.M.A.R.TControlling S.M.A.R.T Performance impactPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor State of the drive prior to testing Drive Self Test DSTDST failure definition ImplementationShort and extended tests Short test Function Code 001bExtended test Function Code 010b Log page entriesShipping Product warrantyProduct repair and return information PowerChoiceTM power management Physical/electrical specificationsPowerChoice modes AC power requirements DC power requirementsSavvio 10K.4 SAS Product Manual, Rev. a Page Page Power sequencing General DC power requirement notesConducted noise immunity Current profiles Current profiles for 600GB modelsCurrent profiles for 450GB models Power dissipation GB models in 3Gb operation600GB models in 6Gb operation 450GB models in 3Gb operation Environmental limits Temperature a. Operating450GB models in 6Gb operation Effective altitude sea level a. Operating Relative humidityShock and vibration Shock Recommended mounting Vibration a. Operating-normal Air cleanlinessCorrosive environment Acoustics Mechanical specifications Mounting configuration dimensionsControlled access Admin SPAbout self-encrypting drives Data encryptionDefault password Random number generator RNGDrive locking Data bandsAuthenticated firmware download Power requirementsSupported commands Cryptographic eraseDrive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Idle Read After Write Installation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsSupported commands Supported commands Supported commands Inquiry data Mode Sense dataSavvio inquiry data Page Mode Sense data for ST9600204SS and ST9600104SS drives Mode PagesMode Sense values for ST9450404SS and ST9450304SS drives Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Section C C Section a a Physical characteristics Connector requirementsElectrical description Pin descriptionsSignal characteristics PowerSAS transmitters and receivers Ready LED OutSAS-2 Specification compliance LED drive signalDifferential signals General interface characteristicsSeagate Technology support services InternetPresales Support Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dialFAX Index NumericsKCC Msid Mtbf See also cooling Page Savvio 10K.4 SAS Product Manual, Rev. a Page Seagate Technology LLC

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