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Environmental Conditions; Reliability - Fujitsu M255XK Customer Engineering Manual

5 1/4" mini-flexible disk drive
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2.8 ENVIRONMENTAL CONDITIONS
Table
2-7 Environmental Conditions
OPERATING
STORAGE
TRANSPORT*
Ambient Temperature
39 to 1150 F
-7.6 to 140 0 F
-40 to 149 0 F
Non-condensi ng
(4 to 46 0 C)
(-22 to 60 0 C)
(-40 to 65 0 C)
Temperature Gradients
590 F/Hour
Not speci fied
86 0 F/Hour
(Maximum)
(150 C/Hour)
(30 0 C/Hour)
Relative Humidity
20 to 80% Max.
10 to 90% Max.
5 to 95% Max.
(Maximum Wet-Bulb)
84 0 F
104 0 F
113 0 F
Non-condensing
(29 0 C)
(40 0 C)
(45 0 C)
Vibration Tolerance
0.50G 55Hz
Not Speci fied
2.0G 100Hz
(Maximum)
0.25G 55 to 150HZ
Shock Tolerance
lOG 10msec
(Maximum)
Not Speci fied
40G 10msec
* Packed in designated crates with conditions conforming to JIS-Z0200 - Provisions
for Correctly Packed Freight Testing Methods; Level
II.
When transport takes place over an extended period (such as trans-oceanic by
ship) the Storage Environmental Conditions apply.
2.9 RELIABILITY
Table 2-8 Reliability
MEAN TIME BETWEEN FAILURES
(MTBF)
11,000 Power-on hours, with 25% duty cycle
MEAN TIME TO REPAIR
30 Minutes Maximum to subassembly level
(MTTR)
PERIODIC MAINTENANCE
Not required. Head Cleaning if necessary
PRODUCT LIFE
5 years
DISK LIFE
Three times 10 6 passes/track minimum
DISKETTE INSERTIONS
One times 10 4 insertions minimum
DATA ERROR RATES:
Soft Read Error Rate
One per 10 9 bits (with up to 2 re-reads)
Hard Read Error Rate
One per 10 12 bits (with more than 2 re-reads)
SEEK ERROR RATE
One per 10 6 seeks
TS-021-013087 ••• 01
2-5

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