Seagate CHEETAH ST34501FC, Руководство по эксплуатации продукта

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28 Cheetah 4LP FC Product Manual, Rev. A
PCB and HDA temperatures
To obtain the maximum temperature for each of the reference components listed, add 20°C to the 1,000,000
hour MTBF case temperatures. The maximum allowable HDA case temperature is 60°C (see Figure 9). Oper-
ation of the drive at the maximum case temperature is intended for short time periods only. Continuous opera-
tion at the elevated temperatures will reduce product reliability. The maximum allowable HDA case
temperature to meet the 1,000,000 hour MTBF is 45°C.
The air-flow pattern with which the temperature guidelines above were generated is shown in Figure 7. Local
average air velocities were 0.92 m/sec (180 lfpm) and inlet air temperature to the drive was 25°C (77°F), plus a
5°C temperature rise in the test enclosure (30°C ambient local to the drive).
Figure 8. PCB temperature measurement locations
Figure 9. HDA case temperature measurement location
Card Component Reference
MTBF
1,000,000 hours at
30°C case temperature
(°C)
HDA Figure 9 50
GAAJ OP Amp 1 48
GAAJ Servo Control 2 50
GAAJ Motor Control 3 52
GAAJ Transceiver 4 56
4
3
2
1
HDA Temp.
Check Point
.5"