1.7 Reliability
C141-E050-02EN 1-9
1.6 Shock and Vibration
Table 1.7 lists the shock and vibration specification.
Table 1.7 Shock and vibration specification
Vibration (swept sine, one octave per minute)
5 to 500 Hz, 1.0G0-peak (MHC series)
5 to 400 Hz, 1.0G0-peak (MHD series)
(without non-recovered errors) (9.8 m/s
2
5 to 500 Hz, 5G0-peak (MHC series)
5 to 400 Hz, 5G0-peak (MHD series)
2
Shock (half-sine pulse, 2 ms duration)
(without non-recovered errors) (980 m/s
2
500G0-peak (no damage) (4,900 m/s
2
1.7 Reliability
(1) Mean time between failures (MTBF)
250H/month or less 3000H/years
20% or less of current time
But humidity bulb temperature
MTBF is defined as follows:
Total operation time in all fields
MTBF= (H)
number of device failure in all fields
“Disk drive defects” refers to defects that involve repair, readjustment, or
replacement. Disk drive defects do not include failures caused by external factors,
such as damage caused by handling, inappropriate operating environments, defects
in the power supply host system, or interface cable.
(2) Mean time to repair (MTTR)
The mean time to repair (MTTR) is 30 minutes or less, if repaired by a specialist
maintenance staff member.
