Write again on failed dvd-r?


my question is simple.

I have a lot of coasters (burning failed
at 4x at about 12% each time)

Are these dvd-r definitively dead or
may I write again on them on the
remaining space (88 %) ?

I’d like to try to burn them at 2X this time

thanks !

If they aren’t +rw or -RW, toss them… RW’s can be reformatted…