Seagate ST3300657SS, 100516226 manual Defect and Error Management, Drive Internal DEFECTS/ERRORS

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9.0DEFECT AND ERROR MANAGEMENT

Seagate continues to use innovative technologies to manage defects and errors. These technologies are designed to increase data integrity, perform drive self-maintenance, and validate proper drive operation.

SCSI defect and error management involves drive internal defect/error management and SAS system error considerations (errors in communications between the initiator and the drive). In addition, Seagate provides the following technologies used to increase data integrity and drive reliability:

•Background Media Scan (see Section 9.4)

•Media Pre-Scan (see Section 9.5)

•Deferred Auto-Reallocation (see Section 9.6)

•Idle Read After Write (see Section 9.7)

The read error rates and specified storage capacities are not dependent on host (initiator) defect management routines.

9.1DRIVE INTERNAL DEFECTS/ERRORS

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable, and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the Read Defect Data command.

Details of the SCSI commands supported by the drive are described in the SAS Interface Manual. Also, more information on the drive Error Recovery philosophy is presented in the SAS Interface Manual.

9.2DRIVE ERROR RECOVERY PROCEDURES

When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery procedures to attempt to recover the data. The error recovery procedures used depend on the options previously set in the Error Recovery Parameters mode page. Error recovery and defect management may involve using several SCSI commands described in the SAS Interface Manual. The drive implements selectable error recovery time limits required in video applications.

The error recovery scheme supported by the drive provides a way to control the total error recovery time for the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in error recovery for a command can be limited using the Recovery Time Limit bytes in the Error Recovery mode page. The total amount of time spent in error recovery for a single LBA can be limited using the Read Retry Count or Write Retry Count bytes in the Error Recovery mode page.

The drive firmware error recovery algorithms consists of 13 levels for read recoveries and five levels for write. Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re-read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and write retry counts.

Table 6 equates the read and write retry count with the maximum possible recovery time for read and write recovery of individual LBAs. The times given do not include time taken to perform reallocations. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recovery time limit for the command has not yet been met. Time needed to perform reallocation is not counted against the recovery time limit.

When the RC bit is one, reallocations are disabled even if the ARRE or AWRE bits are one. The drive will still perform data recovery actions within the limits defined by the Read Retry Count, Write Retry Count, and Recovery Time Limit parameters. However, the drive does not report any unrecovered errors

CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F

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Contents Standard models Self-Encrypting Drive models SED Fips 140-2 modelsPage Contents About Fips About SELF-ENCRYPTING Drives Defect and Error ManagementInstallation Interface RequirementsCheetah 15K.7 SAS Product MANUAL, REV. F III Seagate Technology Support Services SED ScopeFips 140-2 L Evel Compliance STANDARDS, Compliance and Reference DocumentsStandards Taiwanese Bsmi Australian C-TickKorean KCC European Union Restriction of Hazardous Substances RohsGeneral Description Performance Standard FeaturesMedia Description Formatted Capacities FACTORY-INSTALLED OptionsReliability ST3600057SS ST3450857SS ST3300657FCAccess time Performance CharacteristicsInternal Drive Characteristics Format command execution time minutesPREFETCH/MULTI-SEGMENTED Cache Control General performance characteristicsSTART/STOP Time Cache Operation Caching write data Prefetch operationReliability and Service Reliability SpecificationsError Rates 4 S.M.A.R.T Preventive maintenanceHot plugging the drive Controlling S.M.A.R.TReporting control Performance impactMilliseconds Determining rateDrive Self Test DST Temperature Log Page 0DhParameter Code Description DST failure definitionInvoking DST State of the drive prior to testingImplementation Short and extended testsAbort Product warrantyLog page entries ShippingDC Power Requirements PHYSICAL/ELECTRICAL SpecificationsAC Power Requirements 600 GB DC power requirements450 GB DC power requirements 300 GB DC power requirements Current profiles Power sequencingConducted noise immunity Typical 450GB current profiles Power Dissipation Environmental Limits Temperature a. Operating300GB model Relative humidity Effective altitude sea level a. OperatingShock and vibration ShockVibration Recommended mountingCorrosive environment Air cleanlinessAcoustics RoHS compliance statementMechanical Specifications Units of Measure mm inchesSeagate Enterprise SED PurposeValidation Program Data Encryption Controlled AccessAbout SELF-ENCRYPTING Drives Random Number Generator RNGSupported Commands Authenticated Firmware DownloadPower Requirements Drive LockingDrive Error Recovery Procedures Defect and Error ManagementDrive Internal DEFECTS/ERRORS SAS System Errors Read and write retry count maximum recovery timesDeferred AUTO-REALLOCATION Background Media ScanMedia PRE-SCAN Idle Read After WriteCooling InstallationDrive Orientation Drive Mounting GroundingTask management functions SAS FeaturesInterface Requirements Task management responsesScsi Commands Supported Commands supported by Cheetah 15K.7 SAS family drivesCommands supported by Cheetah 15K.7 SAS family drives Commands supported by Cheetah 15K.7 SAS family drives Cheetah 15K.7 inquiry data Mode Sense dataInquiry data Cheetah 15K.7 SAS Product MANUAL, REV. F 11.3.2.1 600GBmodel Mode Sense data 11.3.2.2 450GB model Mode Sense data 11.3.2.3 300GB model Mode Sense data Miscellaneous features Miscellaneous Operating Features and ConditionsSupported Feature or condition SAS physical interfaceDatum B This Area Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers PowerSignal Characteristics Ready LED OutBPS Differential signalsSAS-2 Specification Compliance Additional InformationIndex Page SAS See also cooling Seagate Technology LLC Americas
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