A lead-in is a physical area (about 1.2mm or wider) that precedes the data area on a DVD disc. A burner or player, or any form of reader, uses the lead-in information to determine where the data starts and reads essential sync and control data from this area.
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Nero Burning ROM (Shareware)
Nero is the best and most complete DVDR / CDR / Blu-ray all-in-one software