USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
O E M F U N C T I O N A L SPECIFICATION ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H
7.4 Acoustic Levels
Additionally, the population average of the sound pressure measured one meter above the center of the drive
in idle mode will not exceed 36 dB.
Additionally, the population average of the sound pressure measured one meter above the center of the drive
in idle mode will not exceed 41 dBA.
Notes:
1. The above octave band and maximum sound power levels are statistical upper limits of the sound
power levels. See C-B 1-1710-027 and C-S 1-1710-006 for further explanation.
2. The drive's are tested after a minimum of 20 minutes warm-up in idle mode.
3. The operating mode is simulated by seeking at a rate between 28 and 32 seeks per second.
4. The mean of a sample size of 10 or greater will be less than or equal to the stated mean with
95% confidence.
Upper Limit Sound Power Requirements (Bels) for C1x & C2x Models
Octave Band Center Frequency (Hz)
A-weighted (see notes)
125
250
500
1K
2K
4K
8K
Maximum
Mean
Idle
4.5
3.5
3.3
3.5
4.5
4.5
4.5
5.00
4.7
Operating
4.5
4.0
3.6
4.1
4.8
4.8
4.5
5.25
5.0
Upper Limit Sound Power Requirements (Bels) for C4x Models
Octave Band Center Frequency (Hz)
A-weighted (see notes)
125
250
500
1K
2K
4K
8K
Maximum
Mean
Idle
4.6
3.5
3.3
3.5
4.5
4.8
4.8
5.0
4.7
Operating
4.6
4.0
3.6
4.1
5.1
4.8
4.8
5.3
5.0
Source filename=OPLIMITS
IBM Corporation
Page 83 of 87
