www.makemkv.com

MakeMKV won't save The Guard to disk. I get the following error info:

Saving 1 titles into directory /Volumes/Time Machine/The Guard
Error 'Internal error - Operation was cancelled (112)' occurred while reading '/BDMV/STREAM/00800.m2ts' at offset '0'
Failed to save title 0 to file /Volumes/Time Machine/The Guard/The_Guard_t00.mkv
0 titles saved, 1 failed
Saving 1 titles into directory /Volumes/Time Machine/The Guard
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00800.m2ts' at offset '19372044288'
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00800.m2ts' at offset '19372044288'
Failed to save title 0 to file /Volumes/Time Machine/The Guard/The_Guard_t00

I installed dsall.svq into the data directory, but it makes no difference.

This is not the problem. It plays just fine on a Blu-ray player.

Playing and ripping are not the same thing. When you rip a disc it needs to be able to read every single sector of a disc in order to be able to make a copy. When you play if it hits a bad sector it'll just skip it and you probably won't notice.

Your disc is dirty, poorly pressed or defective, swap it for a new one.