Correct me if I am mistaken Graham, but one of the underlining issues I seemed to notice repeated a few times was the Bank should create it's own procedures/policy. Maybe your policy or procedures won't call for the wiping of a hard drive IF it is staying within the Bank and is still only for the Bank' use? Just an idea.
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"100 victories in 100 battles isnt the most skillful. Subduing the other's military w/o battle is the most skillful." Sun-Tzu