Fujitsu MHA2021AT Shock and Vibration, Reliability, Shock and vibration specification, Mtbf=

Device Overview

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	5 to 500 Hz, 1.0G0-peak
		(without non-recovered errors) (9.8 m/s2 0-peak)
•	Non-operating	5 to 500 Hz, 5G0-peak (no damage) (49 m/s2 0-peak)
Shock (half-sine pulse, 2 ms duration)
•	Operating	100G0-peak
		(without non-recovered errors) (980 m/s2 0-peak)
•	Non-operating	500G0-peak (no damage) (4,900 m/s2 0-peak)

1.7 Reliability

(1) Mean time between failures (MTBF)

The mean time between failures (MTBF) is 300,000 H 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=		(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.

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