Files do not last forever. Corruption can be caused by hard drive failures or unreadable compact disks for instance. The files might be partially readable but this does not help much if it is corrupted. There are some ways of preparing yourself against data loss. One obvious way is of course to make regular backups of your important files. But it could of course happen that backups get corrupted as well which most of the time happens in the worst moments possible.

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Par2 Files are common on the Usenet today.They are not that common on the Internet in general and I can’t think of a location where I encountered them except for the Usenet. Par2 Files can be used to repair broken archives. That is the basic explanation of course, the technical is a little bit more complicated. Lets use a example to make it clearer. Let us assume that you have downloaded a number of rar files (.rar, r01, r02 and so on) that can be unpacked to create the file test.avi which has a size of 700 Megabytes.

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