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C141-E090-01EN 1 - 9
1.6 Shock and Vibration
Table 1.6 lists the shock and vibration specification.
Table 1.6 Shock and vibration specification
Vibration (swept sine, one octave per minute)
• Operating
• Non-operating
5 to 300 Hz, 0.5G-0-peak
(without non-recovered errors)
5 to 400 Hz, 4G-0-peak (no damage)
Shock (half-sine pulse, Operating)
• 2 ms duration
• 11 ms duration
30G (without non-recovered error)
10G (without non-recovered error)
Shock (half-sine pulse, Non-operating)
• 2 ms duration
• 11 ms duration
250G (Typical, no damage)
75G (No damage)
1.7 Reliability
(1) Mean time between failures (MTBF)
The mean time between failures (MTBF) is 500,000 POH (power on hours) or more
(operation: 24 hours/day, 7 days/week).
This does not include failures occurring during the first three months after installation.
MTBF is defined as follows:
MTBF= (H)
"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.
(3) CSS cycle
The number of CSS must be less than 40,000.
Total operation time in all fields
number of device failure in all fields