Probably dust particles and slight rotation while in the backpack.
this post was submitted on 26 Jul 2024
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Oh this takes me back
Likely a slightly warped CD case with a grippy bit in the middle that's undersized. Which means the discs can rotate and then collide with the case. But key to the scratches is the undersized grippy thing, a good case won't let your discs spin.
Cheap cases have been doing that since I was a kid and I burned my first CDs back in the day. Nothing quite like being the cool kid with a CD burner back in the day.
God I'm getting old.