secure deletion

[Bruce Evans]

>> I agree with that last statement. An implementation on FreeBSD probably does
>> not need to write multiple times to the disk.
>
>Wouldn't work, anyway, unless you disable write caching (not just on
>the disk, but in the disk driver as well - no soft updates!).
>Otherwise, all passes but the last will be ignored, unless you wipe a
>really big file (too big to fit in cache).

man fsync

Bruce
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