Seagate Cheetah 18FC ST118202FC, Руководство по эксплуатации продукта

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16 Cheetah 18FC Product Manual, Rev. C
5.3.2 Field failure rate vs time
The expected field failure rate is listed below. Drive utilization will vary. An estimate range of utilization is:
• 720 power-on hours (POH) per month
• 250 on/off cycles per year
• Read/seek/write operation 20% of POH
• System provides adequate cooling to ensure the case temperatures specified in Figures 8 and 9 are not
exceeded. Short term excursions up to the specification limits of the operating environment will not affect
MTBF performance.
Failure rate is calculated as follows:
• No system-induced failures counted
• PPM targets include 30% no defect found and handling failures
• Based on 1,000,000 MTBF and 720 POH per month
• Month 1’s rate includes a 300 PPM installation failure
5.3.3 Preventive maintenance
No routine scheduled preventive maintenance is required.
5.3.4 Service life
The drive has a useful service life of five years. Depot repair or replacement of major parts is permitted during
the lifetime.
5.3.5 Service philosophy
Special equipment is required to repair the drive HDA. To achieve the above service life, repairs must be per-
formed only at a properly equipped and staffed Seagate 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. The drive warranty is voided if the HDA is opened.
5.3.6 Service tools
No special tools are required for site installation or recommended for site maintenance. The depot repair phi-
losophy 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.
5.3.7 Product warranty
Beginning on the date of shipment to the customer and continuing for a period of five years, Seagate warrants
that each product (including components and subassemblies) that fails to function properly under normal use
due to defect in materials or workmanship or due to nonconformance to the applicable specifications will be
repaired or replaced, at Seagate’s option and at no charge to the customer, if returned by customer at cus-
tomer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty procedure. Seagate
will pay for transporting the repair or replacement item to the customer. For more detailed warranty information,
refer to the standard terms and conditions of purchase for Seagate products on your purchase documentation.
Month Parts per million (PPM)
1 2,364
2 1,422
3 1,403
4 1,391
5 1,317
6 1,255
7 1,162
8+ 1,025