Which is/was pretty hard to do on PRESSED CD's as they were covered with a thick coating, and sometimes quite easy to do on CD-R.

> Or when you store cd's in large unboxed stacks, they can stick together, which can also damage the backside.

Also, I only ever experienced that on CD-R, never on pressed CDs.

And to be fair: If you store all your tapes unwinded on a large spool, they also might see some damage over time ;)