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Computer Doctor: My book does indeed have info on drive mounting in the hard disk chapter! What I state (the truth) is that virtually all modern drives can be mounted in any position, which is why you can't find any info from WD for example, it isn't an issue. However there were some older drives for which specifically mounting on end (tail up or tail down) was prohibited, while any other vertical (sideways) or horizontal (either side up) was fine. Some older drives also prohibited any mountings on an angle, only true vertical or horizontal alignments were allowed. The bottom line: if there are any mounting limitations on a particular drive, the tech manual for the drive will always list them, and no drive that I am aware of EVER prohibited upside down mounting, nor would running it either side up affect drive operation in any way. In fact that brings up the question, which side do you think is really UP anyway? In any given drive, approximately half of the heads are always upside down.