Acoustics; Figure 67. Sound Power Levels - Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive Specifications

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.
Mode
Idle
Performance seek mode
Operating
Quiet seek 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)
60-GB, 40GB,
& 30-GB
models
2.6 / 3.0
3.4 / 3.7
2.8 / 3.2
Deskstar 180GXP hard disk drive specifications
57
Typical / Max
120-GB and 180-GB
80-GB models model
2.8 / 3.2 3.0 / 3.4
3.4 / 3.7 3.4 / 3.7
2.9 / 3.3 3.1 / 3.5