Western Digital WDE4360, WDE2170 manual Error Recovery Operations

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WD Enterprise WDE2170/WDE4360

Advanced Product Features

3.17. Error Recovery Operations

Error recovery options are set using MODE SELECT Page 1 (Read/Write Error Recovery Page) and the Write Recovery Threshold and Read Recovery Threshold fields in MODE SELECT Page 0 (WD Vendor Unique Page).

The drive employs a variety of recovery actions based on the type of error that occurs. Separate recovery actions are defined for read errors, write errors, servo errors, and drive fault errors. For a given error type, several different recovery actions may be used. For example, read error recovery may use retries, servo track offsets, channel parameter modification, and software ECC in an attempt to recover the error. Error information is available to the host via the REQUEST SENSE command based on the settings in MODE SELECT Pages 0 and 1.

The drive uses a 3-way interleaved Reed-Solomon ECC operating on 8 bit (1 byte) symbols. On-the-fly ECC is capable of correcting single burst errors up to 1 byte per interleave (24 bits total) with no performance degradation. On-the-fly correction is done in hardware and cannot be disabled. The drive firmware also implements a software ECC, which is capable of correcting single or double burst errors up to 2 bytes per interleave.

Refer to the Western Digital SCSI Implementation Guide (document number 4096- 001116) for more information.

3.18.Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)

Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) is a hard drive firmware technology that performs drive failure prediction by monitoring selected parameters during normal drive operations. The intent of this technology is to minimize unscheduled system downtime caused by predictable drive failures. By monitoring selected parameters, the S.M.A.R.T. firmware can predict some drive failures before they actually occur, allowing the user to schedule drive replacement and minimize system interruptions.

Refer to the Western Digital SCSI Implementation Guide (document number 4096- 001116) for more information.

4079-001045 Rev. B

RELEASED 04-08-97

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Contents Technical Reference Manual Western Digital 4079-001045 Rev. B Released Escription and F Eatures Installation and Maintenance List of Figures List of Tables General Description Description and FeaturesProduct Features Advanced FeaturesData Buffer of 1 Megabyte OptionsSpecifications Performance SpecificationsPhysical Specifications Physical Specifications WDE2170WDE4360 Physical Metric Characteristic Dimension Tolerance Physical DimensionsDimension Inches Millimeters Mechanical Specifications067 069 Drive Axis Definition Released MountingWDE2170 Current Requirements and Power Dissipation WDE2170 +12V Current Profile Current ProfileRipple Input Voltage RequirementsBring-Up Sequence +12 VDC +5 VDCEnvironmental Specifications Shock and Vibration ShockVibration Operating Vibration Temperature and Humidity Temperature and HumidityCooling Component Location MaximumAtmospheric Pressure Mode Typical MaximumAcoustics AltitudeDrive Baseplate Thermocouple Location Pcba Thermocouple Locations 4079-001045 Rev. B Released Reliability Specifications Agency Approvals Product SafetyElectromagnetic Compatibility EMC SCSI-3 SPI Compliant Compatibility TestingEmbedded Servo Control Read Caching and Pre-FetchMedia Defect Management Command Queuing and ReorderingMicrocode Download Reed Solomon ECC On-the-FlyZoned Recording Headerless FormatLED Support Option Block Functions Error Recovery Operations Hot Plug/Unplug Support Scsi Interface and Command SET Physical Characteristics Pin DesignationOption Block Option Block Pin Assignments OPTION/SIGNAL Pins Configuration NotesScsi ID Jumper Table Pins 7 Pins 5 Pins 3 Pins 1Power Connectors and Cables Scsi ConnectorsScsi Physical Interface Drive Outline Pin Scsi ConnectorSignal Name Signal Name Pin NumberIV E O U T L in E SINGLE-ENDED Scsi Connector Differential Scsi Connector Pin Scsi Connector Pin Numbers Pin SCA-2 Scsi ConnectorSINGLE-ENDED Scsi Connector Installation and Maintenance Electrostatic Discharge ESD ProtectionMaintaining the Drive Technical Support Glossary Internal status Glossary WD Enterprise WDE2170/WDE4360 Interface Matrix Appendix A. U Nderstanding the Model NumberIndex WD Enterprise WDE2170/WDE4360 Index H0300 4/97

WDE4360, WDE2170 specifications

Western Digital, a leader in data storage, has introduced innovative products like the WDE2170 and WDE4360 drives, which showcase their commitment to cutting-edge technology and reliability. These models are designed for various applications, from personal computing to larger enterprise solutions.

The WDE2170 is a 2TB hard drive positioned for consumers who require substantial storage for multimedia files, documents, and applications. Its interface features a SATA III connection, providing a robust data transfer rate that can reach up to 6Gbps. This speed ensures that users can access their files quickly and efficiently. Notably, the WDE2170 is equipped with a large cache size that enhances its performance during read and write operations. This makes it an excellent choice for gamers and content creators who need rapid access to their files.

On the other hand, the WDE4360 stands out as a 4TB offering, aimed at professionals and businesses requiring higher capacities. It utilizes advanced data management technologies to ensure data integrity and durability. With a focus on security features, the WDE4360 includes built-in encryption options to protect sensitive information. This model also utilizes advanced error recovery technology, which is vital for maintaining data integrity in RAID configurations or server setups.

Both models are built using Western Digital’s proprietary technologies that emphasize reliability and longevity. The drives are designed to withstand rigorous usage scenarios, making them perfect for environments where data access and protection are paramount. Additionally, these drives have low power consumption, which can help reduce operational costs, especially in larger installations.

The overall design of these drives is tailored for optimal performance and heat dissipation, ensuring that they can function effectively even under heavy loads. Western Digital's commitment to quality means that both the WDE2170 and WDE4360 undergo stringent testing processes to meet high standards of reliability before reaching the consumer market.

In conclusion, the Western Digital WDE2170 and WDE4360 are exceptional storage solutions, providing consumers and businesses with the speed, capacity, and reliability they need. These drives exemplify Western Digital's dedication to innovation and quality in the ever-evolving world of data storage. As data requirements continue to grow, these drives are sure to meet the demands of a diverse array of users.
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