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Looks like HFS+ is fixed-block size
I wrote Trash X. When I added file shredding features to it, I relied on "rm -P" to handle the task. This was an embarassing mistake. In short, "rm -P" does not reliably shred files on HFS+ volumes. In my tests, it only worked on HFS+ in situations where the file to be shredded was larger than the available free space. In all other cases with HFS+, "rm -P" merely deleted the file without overwriting it. It is interesting to note however that "rm -P" takes longer to execute than just "rm". I believe that on HFS+ disks, "rm -P" essentially deletes the old file and creates a new file on each pass and writes its data sequence into it, but that is just conjecture on my part. |
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