I recently helped a colleague of mine, who also does computer repair in the San Diego area, diagnose a data transfer issue. When he would attempt to copy a client's user profile from his internal HD (which had been pulled) to an external HD. Near the beginning of the transfer, Windows would throw an error saying that a file was protected with permissions and cancel the rest of the transfer. I determined that the HD had some bad blocks, which Windows was interpreting as a permissions issue when it would fail to grab that file. Luckily, the data located on the failing block was unimportant, we just had wasted some time and gas. To avoid that problem in the future I recommended that he do data transfers with Directory Sync. It...syncs directories, but when it encounters a file that it can't copy, it will skip it and add it to a log file so at the end of the transfer, you can see what failed to copy. It's a great way to avoid a copy+paste process of elimination when something fails to copy.
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