Seagate ST32272W Manual download pdf (Page 26)

16 Barracuda 4XL Product Manual, Rev. B

5.1.4 Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no

more than ten recoverable seek errors in 10

physical seek operations. After detecting an initial seek error, the

drive automatically reseeks to the addressed track up to 3 times. If a reseek is successful, the Extended Sense

reports a seek positioning error (15h), no seek complete error (02h), or track follow error (09h), and the sense

key reports a recovered error (1h). If all three reseeks fail, a seek positioning error (15h) is reported with a

Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an unrecoverable seek error. Unre-

coverable seek errors are classified as failures for MTBF calculations. Refer to Section 5.1.1.2 of the

SCSI

Interface Product Manual

(part number 77738479) for Request Sense information.

5.2 Reliability and service

You can enhance the reliability of Barracuda 4XL disc drives by ensuring that the drive receives adequate cool-

ing. Section 6.4.1 provides temperature measurements and other information that may be used to enhance the

service life of the drive. Section 8.3.1 provides recommended air-flow information.

5.2.1 Mean time between failure

The production disc drive shall achieve an MTBF of 1,000,000 hours when operated in an environment that

ensures the case temperatures specified in Section 6.4.1 are not exceeded. Short-term excursions up to the

specification limits of the operating environment will not affect MTBF performance.

The following expression defines MTBF

Estimated power-on operating hours in the period

MTBF per measurement period =

Number of drive failures in the period

Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives

in service. Each disc drive shall have accumulated at least nine months of operation. Data shall be calculated

on a rolling average base for a minimum period of six months.

Drive failure means any stoppage or substandard performance caused by drive malfunction.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance shall be required.

5.2.3 Service life

The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted

during the lifetime (see Section 5.2.4).

5.2.4 Service philosophy

Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must

be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of

PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective

servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.

5.2.5 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.4.

The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not

practical since there are no user purchasable parts in the drive.

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