6.10.2 Sound Pressure (Reference)
6.10.2.1 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.
6.10.2.2 Sound Pressure Level
The hard disk drives meet the following sound pressure level.
Figure 52. Sound Pressure Level
Mode Mean Max
Idle on Track 34 dBA 38 dBA
Random Operation 39 dBA 42 dBA
Specification 57
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