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I've had two disks fail in a vertical mounting position. I suspect it is because the motor that is driving the heads has to work constantly to keep the heads in position, fighting against both shocks and gravity.
Mounting the disk flat like it would be mounted in a laptop I believe is the better way to go. Laptop disk manufactures know that a laptop could be used in a car while operating and are able to design the disk around the types of vibrations that will occur in a car.
Vibrations in general are not what will kill the disk. The vibrations have to be near the natural frequency of the disk in order for it to really affect it (unless of course you drop the drive from a five story building...)
Bottom line, chalk up two dead drives that where vertically mounted and zero (so far) for horizontal mounting. Come to think of it, has anyone actually had a disk go bad that was horizontally mounted and could be blamed on the orientation of the mount?
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