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Specifications
2-6 C156-E228-02EN
2.1.5 Reliability
(1) Mean time between failures (MTBF)
The MTBF is 120,000 hours or more. Failures due to disk errors are not included.
Conditions
• Power-on time: 200 hours/month or less
• LD-on time: 20% or less of power-on time
• Ambient temperature: 25°C
Note: The MTBF is defined as follows:
Total operating time in all fields (hours)
MTBF =
Number of device failure in all fields
1) Operating time is the total time in which power is supplied.
2) Device failures include failures requiring repair, readjustment, or
replacement. However, they do not include failures that are not due to the
optical disk drive itself but to external factors such as careless device
handling, nonsupport of environmental requirements, power failures, host
system errors, and interface cable errors.
(2) Service Life
This drive will not require overhaul within the first five years of installation if
properly maintained (both disk media and optical parts cleaned) and handled as
recommended.
Data loss:
Data is not guaranteed if a power failure occurs or the I/F cable is
pulled out while:
• Data is being written to a data block
• A disk is being initialized (formatted)
• Defect processing is in progress
Data is not guaranteed either if the drive is moved with the optical
disk cartridge inserted or the drive is exposed to excessive shock or
vibration.