Maxtor 10K V - Manual (Page 55)

Maxtor Atlas 10K V 4-7
4.6 ACOUSTICS
Table 4-6 specifies the acoustical characteristics of the Maxtor Atlas 10K V hard
disk drive. The acoustics is measured in an anechoic chamber with background
noise <25 dBA.
Table 4-6
Acoustical Characteristics—Sound Power per ISO 7779
1. The specifications for idle and operating acoustic noise as per ISO Standard
7779, “Engineering Methods for Free Field Conditions Over a Reflecting
PLane.” All specifications are sound power level maximum limits, A-
weighted, referred to 1 picowatt as indicated in the standard. The drive will
be mounted for the test in the manufacturer’s defined nominal position.
The unit under test should be supported so that its bottom surface in the test
orientation is less than or equal to 6 centimeters from the chamber floor, but
not in contact with it. The unit should be supported with small, compliant,
well-damped blocks that rest on the floor.
2. The relationship between bels and dBA for sound power is 1 bel = 10dBA.
4.6.1 Acoustic Toned Quality
A typical drive will have no discrete tones that exceeds a tone ratio of 8dB as
measured per ECMA 74,8
th
Edition, December 2003.
OPERATING MODE
SOUND POWER
(MEAN)
SOUND POWER
(MEAN + 3 SIGMA)
MAXTOR ATLAS 10K IV 73.5/147.1/300 GB
Idle On Track
73.5 GB
147.1 GB
300 GB
3.16
3.52
3.67 3.38
3.68
3.91
Seeking Random
73.5 GB
147.1 GB
300 GB
3.60
3.87
3.96 3.72
4.04
4.19