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This is an error message from your drive. It's telling you it can't read the disc. This is not a MakeMKV issue, this is a hardware issue. There are 2 possibilities: Your disc is dirty/damaged/poorly manufactured. Your drive is dying. Option one is significantly more likely. Try cleaning the disc, i...

Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occured while reading '/BDMV/STREAM00001.mts2' at offset 1628762112

got that read error 4 times then failed at 1628897280 several times.

Reported as failed - no copy