Backup vs Straight from Disc? Twin Peaks Disc 8

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I picked up the original 10-disc release of the Twin Peaks Blu-ray set. When I launched MakeMKV - before even opening the disc - my first copy of Disc 8 just spun and spun. Eventually MakeMKV reported an Medium Error with an offset around 24 gigs.

My second copy of Disc 8 opened fine with MakeMKV and didn't report any errors, and everything ripped... except for one title, where it got to about 3/4 finished and then the progress just stopped. The program kept counting the timers, but no progress was being made on the file. It was giving me crazy estimates like 6 hours left, 10 hours left... Pressing the Stop button would not halt the rip. The dialogue came up fine, but then it just stayed stuck.

Then I tried making a backup of the disc to hard drive first - using the decrypt option - which seemed to work fine, and then I ripped it from the backup. Oddly, this seems to have worked just fine and I have my fingers crossed, I'm just copying the files now to my second machine to check them out.

I noticed that the order of the titles was different between when I opened the disc straight from the disc, and when I opened the backup from the hard drive.

Is there any practical difference between doing a backup first and then ripping, vs ripping straight from the disc? Are there any pros and cons that I need to watch out for?

(The Twin Peaks set certainly has authoring/encoding issues, with AV sync corrections on some titles of around 30 seconds - while the resulting MKVs seem to play okay in VLC, they have a length indicator that is longer than the content actually is, and when you get to the end of the content, it then skips ahead to the end of the file. But at least now I hope I don't have any bad discs with this set.)

I don't suspect any issues with my drive. I've ripped hundreds of Blu-rays, and did a handful both before and after the problems with this disc. I've never experienced a problem like this before with MakeMKV.

[Woodstock]

If the backup worked, but converting to MKV files did not, you may have the same type of issue I had with another series.

To start with, follow the procedures in the FAQ in my signature and send the information requested to support@makemkv.com, so that Mike will see it sooner.

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So, this is very strange. After - as mentioned - trying to rip that episode twice, rebooting and cleaning the disc both times, only to have MakeMKV stall at about 3/4 (I left it stalled for a good 10+ minutes) both times while trying to rip it, and then after being able to seemingly successfully rip the episode by making a backup of the disc to the hard drive first, I went back to try ripping it from disc again, with the debug enabled in order to get the log. But this time, it did not stall as it had the previous times.

So... I guess it must have been either some little piece of dust that I didn't notice in my pre-rip inspection, or a general flakiness with these discs. I guess that's problem solved for now, although I sure would have liked to know more about what was going on while MakeMKV was stalled during the rip process.