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Seagate ST4000NM0053, ST1000NM0063, ST1000NM0043, ST2000NM0033, ST2000NM0023 Idle Read After Write

Models: ST4000NM0053 ST4000NM0023 ST32000444SSIM ST32000646NS ST3000NM0063 ST3000NM0053 ST1000NM0043 ST32000647NS ST3000NM0033 ST4000NM0063 ST4000NM0033 ST2000NM0053 ST1000NM0063 ST4000NM0043 ST3000NM0023 ST2000NM0023 ST2000NM0033 ST3000NM0043 ST32000645NS ST2000NM0043

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10.7Idle 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.

48	Constellation ES Series SAS Product Manual, Rev. F

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Seagate ST4000NM0053, ST1000NM0063, ST1000NM0043, ST2000NM0033, ST2000NM0023, ST2000NM0043, ST2000NM0053 Idle Read After Write

Contents

SED Fips 140-2 Models ST32000446SS ST31000426SS ST3500416SSStandard Models Self-Encrypting Drive Models Revision history Contents Defect and error management InstallationAbout Fips About self-encrypting drives Interface requirementsPower Constellation ES Series SAS Product Manual, Rev. F List of Figures Constellation ES Series SAS Product Manual, Rev. F Seagate Technology support services Seagate Online Support and ServicesScope 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 timePrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationReliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenance4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlThermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures 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 entriesProduct repair and return information Product warrantyShipping PowerChoice modes Physical/electrical specificationsPowerChoiceTM power management AC power requirements DC power requirementsRegulation ±5% Constellation ES Series SAS Product Manual, Rev. F +5V Conducted noise immunity General DC power requirement notesPower sequencing Current profiles TB model current profilesConstellation ES Series SAS Product Manual, Rev. F GB model current profiles Power dissipation 2TB models in 3Gb operation2TB models in 6Gb operation 1TB models in 3Gb operation 1TB models in 6Gb operation Os per Second ST3500414SS CURRENT/POWER vs Throughput SAS 3.0GB500GB models in 3Gb operation 500GB models in 6Gb operation Relative humidity Temperature a. OperatingEnvironmental limits Shock Effective altitude sea level a. OperatingShock and vibration Vibration a. Operating-normal Recommended mountingCorrosive environment Air cleanlinessAcoustics Mechanical specifications Mounting configuration dimensionsLevel 2 security About FipsPurpose Controlled access Admin SPAbout self-encrypting drives Data encryptionDefault password Random number generator RNGDrive locking Data bandsAuthenticated firmware download Power requirementsSupported commands Cryptographic eraseDrive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Deferred Auto-Reallocation Background Media ScanMedia Pre-Scan 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 Constellation ES inquiry data Mode Sense dataInquiry data Page Mode Sense data changeable and default values for 2TB drives Mode Sense data changeable and default values for 1TB drives 3a 38 60 30 00 00 02 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Physical interfaceDatum 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 characteristicsConstellation ES Series SAS Product Manual, Rev. F Index NumericsKCC Msid Mtbf See also cooling Page Constellation ES Series SAS Product Manual, Rev. F Page Seagate Technology LLC