Maxtor Atlas SCSI Drive 15K II, Product Manual

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Specifications
Maxtor Atlas 15K 4-7
4.6 ACOUSTICS
Table 4-6 specifies the acoustical characteristics of the Maxtor Atlas 15K 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 Tonal Quality
A typical drive will have no discrete tones that exceed a tone ratio of 6 dB as
measured per ISO 7779, Annex D.
OPERATING MODE SOUND POWER
(MEAN)
SOUND POWER
(MEAN + 3 SIGMA)
MAXTOR ATLAS 15K 18.4/36.7/73.4 GB
Idle On Track
18GB
36GB
73GB 3.6 Bels (typical)
3.6 Bels (typical)
3.6 Bels (typical) 3.8 Bels
3.8 Bels
3.8 Bels
Seeking Random
18GB
36GB
73GB 4.2 Bels (typical)
4.2 Bels (typical)
4.3 Bels (typical) 4.4 Bels
4.4 Bels
4.4 Bels