Can you erase a prerecorded dvd by mistake?

Question

i lent a dvd movie i had purchased to someone when i got it

back there was no info on the disc

Answer 1

No.  Pre-recorded DVD's are finalized at the factory.  That renders them un-eraseable and un-re-recordable.

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Answer 2

You can't, so it sounds like they gave you a different disc back. Once the DVD is burned or stamped, that's it, unless it's an RW.