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1.6
Shock and Vibration
Table 1.6 lists the shock and vibration specification.
Vibration (swept sine, one octave per minute)
• Operating
• Non-operating
Shock (half-sine pulse, 11 ms duration)
• Operating
• Non-operating
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:
Total operation time in all fields
MTBF=
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.
(3)
Service life
In situations where management and handling are correct, the disk drive requires no overhaul
for five years when the DE surface temperature is less than 48°C. When the DE surface
temperature exceeds 48°C, the disk drives requires no overhaul for five years or 20,000 hours
of operation, whichever occurs first. Refer to item (3) in Subsection 3.2 for the measurement
point of the DE surface temperature.
Table 1.6
Shock and vibration specification
C141-E072-01EN
5 to 300 Hz, 0.5G-0-peak
(without non-recovered errors)
5 to 400 Hz, 4G-0-peak (no damage)
10G (without non-recovered errors)
75G (no damage)
(H)
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