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C156-E097-01EN 2 - 7
2.1.5 Reliability
(1) Mean time between failures (MTBF)
The MTBF is 120,000 hours or more. Failure due to disk errors is not included.
Conditions
• Power-on time: 200 hours/month or less
• LD-on time: 20% or less of power-on time
• Environment Temp.: 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 power is applied.
2) Device failures indicate that devices require repair, readjustment, or replacement. Failure
due to external factors such as minor defects during device handling, operation outside
environmental specifications, power failure, host system errors, and interface cable errors are
not included.
(2) Data security at power failure
Except for the data of the block to which write operation is in progress, all data on the disk is
secure from power failure. This does not apply if power failure occurs during disk initialization
(formatting) or defect processing (alternate block allocation).