Your RAR files are getting "singled out" and corrupted on unconnected hard disks? Sounds too funny to be true.My oldest RAR archives that have been stored only on HD are from 1998, and haven't corrupted themselves yet, and it's been what, 8 years now? Maybe you have some kind of horrible radiation or magnetic fields in your area?Get out the tin-foil hat.
Most likely cause: RAR files contain information that allows them detect when they become corrupted. Normal files do not.Hence, everything is really getting corrupted somehow, but you only notice it for the rars.
I'm using RAR since version pre-1.5 (MS-DOS) and it never befaulted me
I think it's .pak ?
Is there a possibility of some kind of background program sabotaging the .rar files?