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Copyright ©2000 Toshiba corporation. All rights reserved.
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9. RELIABILITY
A failure is defined as an inability of the drive to perform its specified function described in the requirements
of this document when being operated under the normal conditions or conditions specified in this document.
However , damages caused by operation mistake, mishandling, accidents, system errors and other damages
that can be induced by the customers are not defined as failure.
.
9.1 Error Rate
9.1.1 Non- Recoverable Error Rate
1 error per 10
13
bits read
The defective sectors allocated to the spare locations in the factory are not counted in the error rate.
9.1.2 Seek Error Rate
1 error per 10
6
seeks
A seek error is a positioning error recoverable by a retry including recalibration.
9.2 Mean Time to Failure (MTTF)
A failure means that the drive can not execute the function defined in this document under the nominal
temperature, humidity and the other conditions specified in this document . Damages caused by operation
mistake, mishandling, system failure and other damages occurred under the conditions which are not
described in this document are not considered as the failure.
MTTF 300,000 hours
Conditions
Power on hours 2,800 hours ( 200 days x 14 hours ) / year)
Operating hours 600 hours ( 200 days x 3 hours ) / year)
Seek hours
1.30 x 10
6
seeks / month
Number of load / unload 70 times / hour ( 60,000 times / year )
Environment
Normal ( 25
o
C, 101.3 kPa ( 1,013 mb ) )
9.3 Product Life
5 years or 20,000 power on hours whichever comes earlier
9.4 Repair
A defective drive should be replaced. Parts and subassemblies should not be repaired individually .
9.5 Preventive Maintenance (PM)
No preventive maintenance is required.