Seagate Hawk 2 ST11900N, Product Manual

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Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. C 31
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7.6.1 Drive Orientation
The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive perfor-
mance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its
side) orientations, and these are the two preferred mounting orientations.
7.6.2 Cooling
Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the
drive will not exceed temperature conditions specified in 7.4.1. Specific consideration should be given to make
sure adequate air circulation is present around the PCBs to meet the requirements of 7.4.1.
7.6.3 Drive Mounting
When mounting the drive using the bottom holes care must be taken to ensure that the drive is not physically
distorted due to a stiff non-flat mounting 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:
k * x = 80 lb (14.0 N)
where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and, ‘x’ represents the out-of plane
mounting surface distortion (units of inches or millimetres). 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 is applied to the fourth point.