Fujitsu MHY2200BS, MHY2160BS, MHY2120BS, MHY2040BS, MHY2080BS, MHY2060BS, MHY2100BS Reliability, Mtbf=

Device Overview

1.7	Reliability
(1)	Mean time between failures (MTBF)
				24H/day or less
		Conditions of 500,000 h	Power-on time
			Operating time	50 % or less of power-on time
			Temperature	5 to 45 °C (Disk Enclosure surface)
			Humidity	8 to 90 % (ambient)
				But humidity bulb temperature
				29 °C or less

Conditions of 300,000 h

Power-on time	24H/day or less
Operating time	50 % or less of power-on time
Temperature	5 to 60 °C (Disk Enclosure surface)
Humidity	8 to 90 % (ambient)
	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 (*1)

*1 "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 or 30,000 hours of operation, whichever occurs first, when the DE surface temperature is less than 45 °C. When the DE surface temperature exceeds 45 °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. The operating conditions of Service life are based on the equal conditions with MTBF.

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