The Master Boot Record (MBR) and Why it is Necessary? What occurs during the System Boot Sequence? The detailed explainations for those and other information on the "master boot record" is seen at http://www.dewassoc.com/kbase/hard_d...oot_record.htm
As it explains there "The master boot record is always located at cylinder 0, head 0, and sector 1, the first sector on the disk.".
A lot now for seeing that corrected will depend on just what you did to what type of drive by what method when you say you intentionally corrupted the mbr. Hopefully you didn't the drive beyond repair.