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Cheetah 18FC Product Manual, Rev. C
8.5
Drive mounting
Mount the drive using the bottom or side mounting holes. If you mount the drive using the bottom holes, ensure
that you do not physically distort the drive by attempting to mount it on a stiff, non-flat surface.
The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define
the allowable mounting surface stiffness:
where K is the mounting surface stiffness (units in lb/in or N/mm) and X is the out-of-plane surface distortion
(units in inches or millimeters). The out-of-plane distortion (X) is determined by defining a plane with three of
the four mounting points fixed and evaluating the out-of-plane deflection of the fourth mounting point when a
known force (F) is applied to the fourth point.
8.6
Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the
user. Maximizing the conductive contact area between HDA ground and system ground may reduce radiated
emissions. If you do not want the system chassis to be connected to the HDA/PCBA ground, you must provide
a nonconductive (electrically isolating) method of mounting the drive in the host equipment; however, this may
increase radiated emissions and is the system designer's responsibility.
K x X = F < 15lb = 67N
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