I have DVD-RW dvd's but most of them I can't use.
I try to erase in Windows 10 but an error says it can't.
I try to format and same thing error says it can't.

I barely ever used these dvd's. Some of
them work but 4 did not. They appear clean on the surface,
no dust or scratches. They're Maxell.

So what's wrong?