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MTBF
=
SECTION 5
MAINTENANCE
5.1
RELIABILITY
To establish mean time between failures, mean time to repair, and service life, operation time must
be greater than 10,000 hours, and field performance data from all field sites must be used in the
calculation.
5.1.1
MEAN TIME BETWEEN FAILURES (MTBF)
MTB F is derived from the following expression:
Operating Hours
Number of Failures
Operating hours means power-on hours minus any maintenance times. The MTBF design goal for
the Model FDD100-5 Disk Drive is 8500 hours.
5.1.2
MEAN TIME TO REPAI R (MTTR)
This is defined as the average time for an adequately trained service engineer to diagnose and correct
problems on-site. MTTR for the Model FDD100-5 Disk Drive is 30 minutes and does not include
travel time or time when the disk drive is not released to the service engineer.
5.1.3
SERVICE LIFE
The Model FDD100-5 Disk Drive is designed and constructed for a minimum useful life of five years.
5.2
DIAGNOSTIC TECHNIQUES
Incorrect operating procedures, faulty programming, damaged diskettes, and soft errors created
by airborne contaminants, random electrical noise, and other external causes, can produce errors
5-1
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