Product manual

Cheetah 36LP FC Product Manual, Rev. C 37
8.4.1 Air flow
The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and head
and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temperature
measurement guidelines described in Section 6.4.1.
Forced air flow may be required to keep temperatures at or below the specified case temperatures of Table 2,
in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is
created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air
inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources
within the rack, cabinet, or drawer environment.
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 14. The air-flow pat-
terns are created by one or more fans, either forcing or drawing air as shown in the illustrations. Conduction,
convection, or other forced air-flow patterns are acceptable as long as the temperature measurement guide-
lines of Section 6.4.1 are met.
Figure 14. Air flow
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.
Note. Air flows in the direction shown (front to back)
or in reverse direction (back to front)
Note. Air flows in the direction shown or
in reverse direction (side to side)
Above unit
Under unit
Above unit
Under unit
K x X = F < 15lb = 67N