4.6ACOUSTICS

Table 4-6specifies 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 4-6Acoustical Characteristics—Sound Power per ISO 7779

 

SOUND POWER

SOUND POWER

OPERATING MODE

(MEAN)

(MEAN + 3 SIGMA)

 

 

 

 

 

 

MAXTOR ATLAS 10K IV 73.5/147.1/300 GB

 

 

 

 

 

 

Idle On Track

 

 

73.5 GB

3.16

3.38

147.1 GB

3.52

3.68

300 GB

3.67

3.91

 

 

 

Seeking Random

 

 

73.5 GB

3.60

3.72

147.1 GB

3.87

4.04

300 GB

3.96

4.19

 

 

 

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.

4.6.1Acoustic Toned Quality

A typical drive will have no discrete tones that exceeds a tone ratio of 8dB as measured per ECMA 74,8th Edition, December 2003.

Maxtor Atlas 10K V 4-7