IBM DTLA-305040 Hard Drive Specifications - Page 73

Acoustics, DTLA-307060/307075, Mode definition, Idle mode., Operating mode.

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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. Mode Idle Operating DTLA-305010/305020/ 305030/305040 Typical Max 3.0 3.4 3.7 4.0 DTLA-307015/307020/ 307030/307045 Typical Max 3.1 3.4 3.4 3.7 DTLA-307060/307075 Typical Max 3.6 3.9 4.5 4.8 Figure 65. 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 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 Deskstar 40GV & 75GXP hard disk drive specifications 61

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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.
4.8
4.5
3.7
3.4
4.0
3.7
Operating
3.9
3.6
3.4
3.1
3.4
3.0
Idle
Max
Typical
Max
Typical
Max
Typical
DTLA-307060/307075
DTLA-307015/307020/
307030/307045
DTLA-305010/305020/
305030/305040
Mode
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
Deskstar 40GV & 75GXP hard disk drive specifications
61