Seagate ST19171WC Product Manual - Page 26
SCSI Interface Product Manual
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16 Barracuda 9 Product Manual, Rev. C 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 should not be more than 1 recoverable seek error in 107 physical seek operations. After detecting an initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning error (15h) is reported with a Medium (3h) or Hardware error (4h) reported in the Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to Section 5.1.1.2 of SCSI Interface Product Manual (part number 77738479). 5.2 Reliability and service You can enhance the reliability of Barracuda 9 disc drives by ensuring that the drive receives adequate cooling. Section 6.0 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 achieves an MTBF of 1,000,000 hours when operated in an environment that ensures that the case temperatures specified in column 2 of Table 3 (Section 6.4.1) are not exceeded. Shortterm excursions up to the specification limits of the operating environment (given in Table 3, column 1) will not affect MTBF performance. Continual or sustained operation at case termperatures above the values shown in Table 3, column 2, may degrade product reliability. The following expression defines MTBF MTBF per measurement period = Estimated power-on operating hours in the 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 drive shall have accumulated at least nine months of operation. Data shall calculate 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 has 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. To achieve the five-year 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. The 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 because users cannot purchase individual parts for the drive.