Fujitsu MCJ3230AP manual Reliability, Mtbf=

Models: MCJ3230AP

1 199
Download 199 pages 21.43 Kb
Page 42
Image 42

Specifications

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) Service Life

Under appropriate handling and operation, disk cleaning and optical head cleaning, overhaul of the drive is not required for the first five years.

(3) 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).

2-6

C156-E205-01EN

Page 42
Image 42
Fujitsu MCJ3230AP manual Reliability, Mtbf=