Defect And Error Management; Drive Internal Defects And Errors; Scsi Systems Errors - Seagate ST34520N - Medalist 4.55 GB Hard Drive Product Manual

Medalist Pro Product Manual, Rev. D
7.0

Defect and error management

The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are
not dependent upon use of defect management routines by the host (initiator).
Defect and error management in the SCSI system involves the drive internal defect/error management and
SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in
designing a defect/error management plan are briefly outlined in this section, with references to other sections
where further details are given.
7.1

Drive internal defects and errors

Identified defects are recorded on the drive defects list tracks (referred to as the primary or ETF defect list).
These known defects are reallocated during the initial drive format operation at the factory. (See Section
5.2.1.2, "Format Unit command" in the SCSI Interface Product Manual , part number 77738479). Data correc-
tion by ECC will be applied to recover data from additional flaws if they occur.
Details of the SCSI commands supported by the drive are described in SCSI Interface Product Manual .
7.2

SCSI systems errors

Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual. Message Protocol System is described in the SCSI Interface Product Manual . Several of the
messages are used in the SCSI systems error management system. The Request Sense command returns
information to the host about numerous kinds of errors or faults. Appendix A of this manual lists the sense keys
and additional sense codes supported by the drives of this manual. The Receive Diagnostic Results reports
the results of diagnostic operations performed by the drive.
Status returned by the drive to the Initiator is described in the SCSI Interface Product Manual . Status reporting
plays a role in the SCSI systems error management and its use in that respect is described in sections where
the various commands are discussed.
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