6.9.2 Sound Pressure (Reference)
6.9.2.1 Unit Sound Pressure Level Measurment
The hard disk drives are measured in a semi-anechoic chamber, with background noise = < 25 dBA. Sur-
faces to be measured are top cover side and card side. Microphone is set one meter above the drive surface.
Random operation mode is simulated with 40% seek and 60% idle in time.
6.9.2.2 Sound Pressure Level
The hard disk drives meet the following sound pressure level.
Figure 53. Sound Pressure Level of DTTA-35xxxx
Mode
Mean
Max
Idle on Track
33 dBA
37 dBA
Random Operation
38 dBA
41 dBA
Figure 54. Sound Pressure Level of DTTA-37xxxx
Mode
Mean
Max
Idle on Track
34 dBA
38 dBA
Random Operation
39 dBA
42 dBA
Specification
57
Содержание DTTA-350320
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