The damage was done from label side, however with CDs there’s just a thin lacquer layer below the label and that’s it. Image source
Which is why you also shouldn’t write onto CDs with permanent markers.
DVDs on the other hand have a relatively thick plastic layer on top, offering fairly good protection. Image source
![[Rant] I am too dumb to be left alive. I just tried to clean a CD with Isopropyl Alcohol...](https://i.imgur.com/OrXJoDC.jpg){kind=link}
Does this damage the label or data side?
The damage was done from label side, however with CDs there’s just a thin lacquer layer below the label and that’s it.
Image source
Which is why you also shouldn’t write onto CDs with permanent markers.
DVDs on the other hand have a relatively thick plastic layer on top, offering fairly good protection.
Image source
Edit: Added white background to 1st image