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Seagate ST3146356FC, ST3300656FC, ST3450856FC manual Idle Read After Write

Models: ST3450856FC ST3300656FC ST3146356FC

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7.7Idle 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.

Cheetah 15K.6 FC Product Manual, Rev. A

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Seagate ST3146356FC, ST3300656FC, ST3450856FC manual Idle Read After Write

Contents

ST3450856FC ST3300656FC ST3146356FC Cheetah 15K.6 FCPage Contents Defect and error management InstallationInterface requirements Seagate Technology support services Cheetah 15K.6 FC Product Manual, Rev. a List of Figures Page Scope Cheetah 15K.6 FC Product Manual, Rev. a Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS Ncits TR-20 Reference documentsCheetah 15K.6 FC Product Manual, Rev. a General description Media description Standard featuresFormatted capacities Factory-installed optionsPerformance ReliabilityUser-installed accessories Access time Performance characteristicsInternal drive characteristics Seek performance characteristicsPrefetch/multi-segmented cache control Format command execution time minutesGeneral performance characteristics Start/stop timeCaching write data Cache operationPrefetch operation Unrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsMilliseconds 4 S.M.A.R.TControlling S.M.A.R.T Performance impactThermal monitor Reporting controlDetermining rate Predictive failuresDST failure definition State of the drive prior to testingParameter Code Description Drive Self Test DSTExtended test Function Code 010b Invoking DSTShort and extended tests Short test Function Code 001bProduct repair and return information Product warrantyAbort ShippingCheetah 15K.6 FC Product Manual, Rev. a DC power requirements for ST3450856FC model Gbit Amps Physical/electrical specificationsAC power requirements DC power requirementsDC power requirements for ST3146356FC model Gbit Amps DC power requirements for ST3300656FC model Gbit AmpsCurrent profiles General DC power requirement notesPower sequencing Conducted noise immunityTypical ST3450856FC current profiles Typical ST3300656FC current profiles Typical ST3146356FC current profiles ST3450856FC Power dissipationST3300656FC Temperature Environmental limitsST3146356FC Shock Relative humidityEffective altitude sea level Shock and vibrationPackage size Packaged/product weight Drop height Recommended mounting Corrosive environment Air cleanlinessVibration AcousticsElectromagnetic susceptibility RoHS compliance statementMounting configuration dimensions Mechanical specificationsCheetah 15K.6 FC Product Manual, Rev. a Defect and error management Drive internal defects/errorsDrive error recovery procedures Page Background Media Scan FC-AL system errorsDeferred Auto-Reallocation Media Pre-ScanIdle Read After Write Cheetah 15K.6 FC Product Manual, Rev. a Cooling InstallationDrive ID/option selection Drive orientationAir flow Drive mountingGrounding Cheetah 15K.6 FC Product Manual, Rev. a Interface requirements FC-AL featuresFibre Channel link service frames Link services supported Type of frameFibre Channel task management functions Fibre Channel task management responsesFC Scsi FCP response codes Function name Response code NPort login Plogi payload Bytes Fibre Channel port loginProcess Login Plri payload Fibre Channel port login acceptFibre Channel Process Login NPort Login Accept ACC payload BytesFabric Login Flogi payload Bytes Fibre Channel Process Login AcceptFibre Channel fabric login Process Login Accept ACC payload BytesFabric Login Accept ACC payload Bytes Fibre Channel fabric accept loginOption Supported Dual port supportFibre Channel Arbitrated Loop options FC-AL options supportedSupported commands Command code Command name Scsi commands supportedVerify error recovery page 07h Cheetah 15K.6 FC Product Manual, Rev. a Temperature page 0Dh Mode Sense data Inquiry dataCheetah 15K.6 FC inquiry data Bytes Data hex Page Mode Data Header 000000 Cheetah 15K.6 FC Product Manual, Rev. a Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionPhysical characteristics FC-AL physical interfacePhysical description Connector requirements Electrical descriptionPin descriptions FC-SCA pin descriptions Pin Signal name Signal type Pin Signal name Signal typeFC-AL transmitters and receivers Fault LED Out PowerEnable port bypass signals Active LED OutMotor start controls 11 SEL6 through SEL0 ID lines Parallel Enclosure Services Interface ESISetting Arbitrated loop physical address Alpa valuesHex Dec Signal characteristics TTL input characteristicsDevice control codes LED driver signals FC Differential outputFC Differential input Receive eye diagram Eye diagram data values Link rate GHz Cheetah 15K.6 FC Product Manual, Rev. a Technical Support Seagate Technology support servicesInternet Presales SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Numerics IndexFAN Flogi Plogi Page See also cooling