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Cheetah 4LP FC Product Manual, Rev. A
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 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 defection of the fourth mounting point when a known
force (F) is applied to the fourth point.
8.6
Grounding
Signal ground (PCB) 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. A bracket shield with tapped holes is available to system integrators. This shield makes it easier to
attach a braid or similar high-frequency grounding device. If you do not want the system chassis to be con-
nected to the HDA/PCB 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 = F < 15 lb = 67N
29
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