(3)Environmental temperature
Temperature condition at installed in a cabinet is indicated with ambient temperature measured 3 cm from the disk drive. At designing the system cabinet, consider following points.
∙ Make a suitable air flow so that the DE surface temperature does not exceed 55°C.
CAUTION
An air flow with an adequate wind velocity must be maintained to deal with much heat generated from the MAC30xxxx.
Reference value: An air flow with a wind velocity of more than
0.5m/s is required in an environment at 40°C, and an air flow with a wind velocity of more than 1.0m/s in an environment at 45°C (Center of DE cover 55°C).
∙Cool the PCA side especially with air circulation inside the cabinet. Confirm the cooling effect by measuring temperature of specific ICs and the DE. These measurement results should be within a criteria listed in Table 4.1.
Table 4.1 Surface temperature check point
No. | Measurement point | Criteria |
|
|
|
1 | Center of DE cover | 55°C |
|
|
|
2 | Read channel LSI | 83°C |
|
|
|
3 | VCM/SPM Driver | 75°C |
|
|
|
4 | HDC | 85°C |
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|
|
4
1
2
3
Figure 4.8 Surface temperature measurement points (MAA31xxxx/MAB30xxxx/ MAC30xxxx)
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