4.1 Mounting Requirements
(6)Environmental temperature
Temperature condition at installed in a cabinet is indicated with ambient temperature measured 30 mm from the HDD. At designing the system cabinet, consider following points.
•Make a suitable air flow so that the DE surface temperature never exceed 60°C.
•Cool the PCBA side especially with air circulation inside the cabinet. Confirm the cooling effect by measuring the surface temperature of specific ICs and the DE. These measurement results must satisfy the temperature condition listed in Table 4.1.
•Keep the DE surface temperature at 50°C or below to meet the condition for assuring an MTBF of 1,400,000 hours. An air flow of 0.5m/s or more is required at ambient temperature 30°C.
Table 4.1 Surface temperature check point and maximum temperature
No. | Measurement point | Maximum temperature | ||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1 | DE Surface |
|
|
| 60°C |
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2 | Read channel LSI |
|
|
| 82°C |
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3 | VCM/SPM Driver |
|
|
| 93°C |
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4 | HDC |
|
|
| 97°C |
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 | MPU |
|
|
| 94°C |
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
| 1 |
|
|
|
| 4 | 5 |
| 3 |
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2
Figure 4.5 Surface temperature measurement points
(7)Environmental magnetic field
Do not install the HDDs in the vicinity of equipment giving off strong magnetic fields, such as monitors, televisions, or loudspeakers.
(8)Leakage magnetic flux
Do not mount the HDDs near the devices that the leakage magnetic flux influence easily.
45 |
