Plate Drive Installation Instructions H-3
Heatsink Surface and Flatness Requirements
The drive comes with a thermal pad designed to provide a good interface 
between the drive and heatsink. However, in order for this to function 
properly the mounting surface for the plate drive must be clean and free 
of dirt, oil, and debris. It must be very flat and smooth and should have 
no scratches, nicks, or gouges. All mounting holes must be clean and 
deburred.
Table H.C   Surface Requirements
Figure H.2  Smoothness Tolerance and Surface Pad Thickness 
Figure H.3  Trueness Tolerance 
Attribute Requirement Description
Surface Finish 1.6 µM (Ra Method) Smoothness – Overall surface texture free from 
imperfections (scratches, nicks, or gouges)
Surface Flatness -/+ 1.5 mil Trueness – Free from warps, twists, and concavity 
(depressions)