Acoustics - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996
The specified shock pulse is a half sine wave with a duration of 11 msec.
Shock measurements are taken directly on the drive chassis.
Operating----normal
The drive shall perform to specification while being subjected to continu-
ous vibration or intermittent shock not exceeding the shock and vibration
specification.
Operating----abnormal
The drive shall incur no physical damage while subjected to periodic
vibration or intermittent shock. Performance degradation may occur
during the abnormal period, but performance shall return to normal when
normal operating levels resume. Cumulative application of abnormal
shock or vibration to write and read verify operations can cause exces-
sive recoverable data errors. No adjacent track corruption shall occur
during this operation.
Nonoperating
The nonoperating shock and vibration limits apply to all conditions of
handling and transportation. This includes both isolated devices and
integrated equipment.
The drive shall not incur physical damage or performance degradation
from continuous vibration or nonrepetitive shock.
Shock
5--22 Hz vibration
22--350 Hz vibration 0.50 Gs

1.10 Acoustics

This table shows the overall A-weighted acoustic sound power levels for
the drive. All measurements are generally consistent with ISO document
7779. Sound power measurements are taken under essentially free-field
conditions over a reflecting plane. The drive is oriented with the cover up
for all tests.
Overall A-weighted Value
Sound power, typ (bels)
Sound power, max (bels)
Operating Abnormal
2 Gs 5 Gs
0.020-inch 0.030-inch
peak-to-peak peak-to-peak
0.75 Gs
0-to-peak 0-to-peak
Idle Seek
4.1 4.4
4.6 4.9
13
Nonoperating
75 Gs
0.081-inch
peak-to-peak
2.00 Gs
0-to-peak