Hi, shred's man and info pages devote several paragraphs to explain "a very important assumption: that the file system overwrites data in place."
However, they don't mention that the underlying storage also has to meet this criterium. In particular, today's widely used SSD drives are known to perform wear leveling, i.e. rearrange the blocks as they please. I think shred's documentation should devote a section to storage media, too. (On a side note, the man and info pages are slightly out of sync. E.g. the info page mentions BFS and NTFS as journaling file systems, the man page doesn't.) thanks a lot, egmont
