change of colour is always a sign of degrading media.
If there are data on the disc, backup them as soon as possible.
Don’t use these discs for anything important from now on.
[QUOTE=pepst;2238093]do you mean the label side, right?
Yellowing is usual (although undesirable) process and it does not have any impact on data integrity.[/QUOTE]Haven’t had yellowing DVD media, but yellowing CD media were going bad here.