IBM IC35L036UWDY10 Hard Drive Specifications - Page 59

acoustics, Ns = 0.4 / Tt + Tl

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7.9 Acoustics The upper limit criteria of the A-weighted sound power levels are given in Bel relative to one pico watt and are shown in the following table. The measurement method is in accordance with ISO7779. Drives are to meet this criteria in both board up and board down orientations. Model Mode 146 GB all other models Idle Operating Idle Operating A-weighted sound power level (Bel) Typical Maximum 3.7 4.1 4.5 4.8 3.4 3.8 4.5 4.8 Figure 46. A-weighted sound power levels Background power levels of the acoustic test chamber for each octave band are to be recorded. Sound power levels are measured with the drive supported by spacers so that the lower surface of the drive is located 25 ± 3mm height from the chamber desk. No sound absorbing material shall be used. The acoustical characteristics of the drive subsystem are measured under the following conditions. Idle mode: Powered on, disks spinning, track following, unit ready to receive and respond to control line commands except approximately once per minute when the idle time function sweeps the disk surface. Operating mode: Continuous random cylinder selection and seek operation of the actuator with a dwell time at each cylinder. Seek rate for the drive is calculated per the formula below: Ns = 0.4 / (Tt + Tl) Ns = average seek rate in seeks/sec. Tt = published random seek time. Tl = time for the drive to rotate by half a revolution. Ultrastar 146Z10 hard disk drive specifications 43

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7.9
Acoustics
The upper limit criteria of the A-weighted sound power levels are given in Bel relative to one pico watt and
are shown in the following table. The measurement method is in accordance with ISO7779.
Drives are to
meet this criteria in both board up and board down orientations.
4.8
4.5
Operating
3.8
3.4
Idle
all other models
4.8
4.5
Operating
4.1
3.7
Idle
146 GB
Maximum
Typical
A-weighted sound power level
(Bel)
Mode
Model
Figure 46.
A-weighted sound power levels
Background power levels of the acoustic test chamber for each octave band are to be recorded.
Sound
power levels are measured with the drive supported by spacers so that the lower surface of the drive is
located 25 ± 3mm height from the chamber desk.
No sound absorbing material shall be used.
The
acoustical characteristics of the drive subsystem are measured under the following conditions.
Idle mode:
Powered on, disks spinning, track following, unit ready to receive and respond to control line com-
mands
except approximately once per minute when the idle time function sweeps the disk surface.
Operating mode:
Continuous random cylinder selection and seek operation of the actuator with a dwell time at each
cylinder.
Seek rate for the drive is calculated per the formula below:
Ns = 0.4 / (Tt + Tl)
Ns = average seek rate in seeks/sec.
Tt = published random seek time.
Tl = time for the drive to rotate by half a revolution.
Ultrastar 146Z10 hard disk drive specifications
43