IBM DTTA-351010 Hard Drive Specifications - Page 65
Sound Pressure Reference
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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. Surfaces 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 Idle on Track Random Operation Mean 33 dBA 38 dBA Max 37 dBA 41 dBA Figure 54. Sound Pressure Level of DTTA-37xxxx Mode Idle on Track Random Operation Mean 34 dBA 39 dBA Max 38 dBA 42 dBA Specification 57
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