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C
ONSTELLATION
ES.3 SAS P
RODUCT
M
ANUAL
, R
EV
. C
47
10.3
D
RIVE MOUNTING
Breather Hole
Do Not
Cover
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.
Breather hole location - top cover
10.4
G
ROUNDING
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the user. The equipment in which
the drive is mounted is connected directly to the HDA and PCBA with no electrically isolating shock mounts. If it is desired for the
system chassis to not be connected to the HDA/PCBA ground, the systems integrator or user must provide a nonconductive (electrically
isolating) method of mounting the drive in the host equipment.
Increased radiated emissions may result if you do not provide the maximum surface area ground connection between system ground and
drive ground. This is the system designer’s and integrator’s responsibility.
N
OTE
Do not cover breather hole on top cover.
K x X = F < 15lb = 67N