When mapping allocate and isolate bad sectors in the firmware is it exhausted the files that I download and transfer to the HDD started to be saved in the bad sectors corrupting them and when I burn the DVD with these files will I be burning corrupted files? the files are zip, rar, exe

A corrupt file will be corrupt after you burned it. You are simply copying a corrupt file to another drive.

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Joep - http://www.disktuna.com - video & photo repair & recovery service

What are all the protection barriers that prevent files from being corrupted because they are in bad sectors and badblocks? when a file is recorded in a good sector of the HDD, that sector becomes bad, corrupting the zip file and exe that will be burned to DVD?