VIETA VNT7800BT Owner's Manual page 6

DISC NOTES
Preparing New Discs with Rough Spots
A new disc may have rough edges on its inside and outside edges. If a disc with
rough edges is used, the proper setting will not be performed and the player will not
play the disc. Therefore, remove the rough edges in advance by using a ballpoint pen
or pencil as shown on the right. To remove the rough edges, press the side of the pen
or pencil against the inside and outside edges of the disc.
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