It depends on your level of paranoia, really. Depending on the
write access pattern of the file over time (has it seen lots of
shrinking and growing?) you may find pieces of it all over the disk,
in addition to what your operating system believes to be presently
allocated to it. Does the system ever load this file into core and
then have the potential to swap it out? Information tends to leak
much more than we think it does.
If this is potentially a problem, you want a program that will
wipe the unallocated portions of the disk as well as the part the OS
believes to be allocated to the file.
Last I checked those who were truely paranoid didn't consider it
gone until the magnetic medium has been destructively slagged in some
fashion or another (sanded off, melted, what have you).
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