The exact opposite of non-destructive recording, destructive recording overwrites pre-existing data. Once new tracks are recorded over old, the old tracks cannot be retrieved.
“I can talk to my Sales Engineer about any piece of equipment, and he always steers me in the right direction. He truly knows what he's talking about, and he never tries to over-sell me on anything. If he worked in the Nashville area, I'd probably owe him about 20 dinners by now!” Michael Erin Woody, Brentwood, TN