Fujitsu MCM3064SS Manual Do Utilizador

2-6 C156-E228-02EN 

(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 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.