Additional suggestion: mail/freight a
USB stick rather than a mechanical HD. They're smaller, more rugged, and probably easier to attach at the other end (where do you stick an external HD in a rack full to the brim of 1RU servers?)
I sent 2 x 32GB sticks to my host a few months ago... no worries at all. One of the staff even forked out a few bucks of his own money to return it since they didn't have an easy way to one-off bill me for it.
