this post was submitted on 26 Jul 2024
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This wear pattern is formed by spinning while some rough object touches the disk. Are you spinning them a lot in the cases with your fingers - absentmindedly? If not, it's for sure the player.
Nope, but they may spin while in the backpack. Additionally they may also get pressed slightly. The scratches also develop on the cases themselves.
I find it hard to believe that they'd spin so much while inside a case, no matter how it's rattled. That said, stranger things have happened.