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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)
• Operating
• Non-operating
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
0-peak)
5 to 500 Hz, 5G0-peak (MHC series)
5 to 400 Hz, 5G0-peak (MHD series)
(no damage) (49 m/s
2
0-peak)
Shock (half-sine pulse, 2 ms duration)
• Operating
• Non-operating
100G0-peak
(without non-recovered errors) (980 m/s
2
0-peak)
500G0-peak (no damage) (4,900 m/s
2
0-peak)
1.7 Reliability
(1) Mean time between failures (MTBF)
Conditions of 300,000 h
Current time
250H/month or less 3000H/years
or less
Operating time
20% or less of current time
CSS operations
50/day or less
Total 50,000 or less
Power on/off
1/day or more needed.
Environment
5 to 55°C/8 to 90%
But humidity bulb temperature
29°C or less
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.