Acoustics; Figure 65. Sound Power Levels - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

7.9 Acoustics

The upper limit criteria of the octave sound power levels are given in Bels relative to one pico watt and
are shown in the following table. The sound power emission levels are measured in accordance with
ISO 7779.
DTLA-305010/305020/
Mode 305030/305040
Typical
Idle 3.0
Operating 3.7

Figure 65. Sound power levels

Mode definition:
Idle mode. The drive is powered on, disks spinning, track following, unit ready to receive and re-
spond 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 listed below:
Ns = 0.4/(Tt + TI)
Ns = average seek rate in seeks/sec
Tt = published random seek rate
TI = time for the drive to rotate by half a revolution
DTLA-307015/307020/
307030/307045
Max Typical
3.4 3.1
4.0 3.4
Deskstar 40GV & 75GXP hard disk drive specifications
DTLA-307060/307075
Max Typical
3.4
3.7
61
Max
3.6 3.9
4.5 4.8