IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 72

Acoustics

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6.9 Acoustics The upper limit criteria of the octave sound power levels are given in Bels relative to one picowatt and are shown in the following table. The sound power emission levels are measured in accordance with ISO 7779. Typical Mode 1 and 3 disk models 2 disk models Max Idle 3.1 3.0 3.4 Operating Performance seek mode Quiet seek mode 3.4 3.2 3.4 3.7 3.1 3.5 Figure 67. Sound power levels Mode definition: Idle mode. The drive is powered on, disks spinning, track following, unit ready to receive and respond to interface commands. Operating mode. Continuous random cylinder selection and seek operation of the actuator with a dwell time at each cylinder. The seek rate for the drive is to be calculated as shown below: ! Dwell time = 0.5 x 60/RPM ! Seek rate = 0.4 / (Average seek time + Dwell time) Deskstar 120GXP hard disk drive specifications 58

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6.9 Acoustics
The upper limit criteria of the octave sound power levels are given in Bels relative to one picowatt and are
shown in the following table. The sound power emission levels are measured in accordance with
ISO 7779.
3.5
3.1
3.2
Quiet seek mode
3.7
3.4
3.4
Performance seek mode
Operating
3.4
3.0
3.1
Idle
2 disk models
1 and 3 disk
models
Max
Typical
Mode
Figure 67. Sound power levels
Mode definition:
Idle mode.
The drive is powered on, disks spinning, track following, unit ready to receive and
respond to interface commands.
Operating mode.
Continuous random cylinder selection and seek operation of the actuator with a
dwell time at each cylinder.
The seek rate for the drive is to be calculated as shown below:
!
Dwell time = 0.5 x 60/RPM
!
Seek rate = 0.4 / (Average seek time + Dwell time)
Deskstar 120GXP hard disk drive specifications
58