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Seagate ST973252SS, ST973452SS, ST973352SS, ST9146752SS, ST9146852SS manual Idle Read After Write

Models: ST9146652SS ST973352SS ST973252SS ST973452SS ST9146752SS ST9146852SS

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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.

42	Savvio 15K.2 SAS Product Manual, Rev. E

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Seagate ST973252SS, ST973452SS, ST973352SS, ST9146752SS, ST9146852SS, ST9146652SS manual Idle Read After Write

Contents

Standard Models Self-Encrypting Drive Models ST9146852SSST9146752SS ST973452SSST973352SSST9146652SS ST973252SS SED Fips 140-2 ModelsPage Contents About Fips About self-encrypting drives Defect and error managementInstallation Interface requirementsPage Savvio 15K.2 SAS Product Manual, Rev. E List of Figures Page Seagate Technology support services Seagate Online Support and Services Scope Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibility Australian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean MIC Reference documents European Union Restriction of Hazardous Substances RoHS General description Standard features Media description Formatted capacities PerformanceReliability Programmable drive capacity Options Seek performance characteristics Performance characteristicsInternal drive characteristics Access time Start/stop time Format command execution timeGeneral performance characteristics Prefetch/multi-segmented cache control Cache operation Caching write data Prefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable Errors Interface errors Reliability and serviceSeek errors Preventive maintenance Performance impact 4 S.M.A.R.TControlling S.M.A.R.T Reporting control Thermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures DST failure definition State of the drive prior to testingDrive Self Test DST Implementation Extended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entries Product repair and return information Product warrantyShipping DC power requirements Physical/electrical specificationsAC power requirements 146GB models DC power requirements Gbit mode Amps 73GB models DC power requirements Conducted noise immunity General DC power requirement notesPower sequencing Current profiles Current profile for 146GB models Current profile for 73GB models 146GB models in 3.0 Gbit operation Power dissipation146GB models in 6.0 Gbit operation 73GB models in 6.0 Gbit operation 73GB models in 3.0 Gbit operation Relative humidity Temperature a. OperatingEnvironmental limits Shock Effective altitude sea level a. OperatingShock and vibration Recommended mounting Corrosive environment Air cleanlinessVibration a. Operating-normal Acoustics Mechanical specifications Dimensions Level 2 security About FipsPurpose About self-encrypting drives Controlled accessAdmin SP Data encryption Drive locking Default passwordRandom number generator RNG Data bands Supported commands Authenticated firmware downloadPower requirements Cryptographic erase Drive 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 orientation Cooling Air flow Drive mounting Grounding SAS features Interface requirements Dual port support Scsi commands supported Supported commands Supported commands Supported commands Supported commands Savvio inquiry data Mode Sense dataInquiry data Page Mode Data Header 00 00 05 12 8B 00 10 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptions SAS pin descriptions SAS transmitters and receivers Signal characteristics Additional information SAS-2 Specification complianceGeneral interface characteristics Savvio 15K.2 SAS Product Manual, Rev. E Index Numerics Iraw Msid Mtbf See also cooling