Errors with one disc in the Star Trek TNG box set

[sploo]

I picked up a used box set of all of the Star Trek TNG episodes on blu-ray (2020 CBS Studio). I've only got one old PC that has an (old) blu-ray drive so I wanted to use MakeMKV (v1.18.2, on Windows) to rip the discs to watch on another PC.

Of the 41 discs, 40 went well, but I'm unable to extract a couple of the episodes from one disc. There's no obvious signs of damage on the disc.

The blu-ray drive is a Lite-On iHBS112 2, which initially had firmware CL04. I upgraded it to the latest (PL06) but it still fails the read the disc. I've attached the log files from a CL04 and a PL06 run.

I tried an alternative technique I spotted on the forum: start a backup with MakeMKV, uncheck the decrypt option, let it run until it gets to the first m2ts file, stop the backup, quit MakeMKV, delete the incomplete BDMV folder and drag-and-drop the BDMV folder from the disc to the backup folder. Eject the disc, start MakeMKV, select File>Open Files and double click the discatt.dat file created by the previously cancelled backup.

When copying the BDMV folder I had to retry a few times, but it did eventually succeed. However, the MakeMKV still couldn't get all the episodes from the copy of the blu-ray in the backup folder.

Based on the above - is it more likely to be a bad disc, or my old blu-ray drive that's the problem?

[Woodstock]

More likely a dirty disk. I've ripped the entire TNG series on BD in the past (and will be again soon), so I know it works.

[sploo]

I had given the disc a gentle clean after the first failed attempt, but unfortunately that didn't made a difference.

As I'm not the original purchaser of the set I guess I might be out of luck in getting that disc replaced.

[britb4usa]

Hello - I have just started ripping TNG blu-rays to add to my media server and need some help please.

Also, if your disc is damaged, I could give you an iso or something to help? I have been watching some of my older boxsets like Stargate and found some discs have gone bad (rot), guess they used the cheapest media possible

So, my issue is starting with disk one, looks like 3 episodes should be on there but I found the 3 titles I ripped do not match when I watch them back and compare to the disc and the intro is missing on all of them, what I am doing wrong and is there any way to better automate or otherwise identify which title matches which episode?

Many thanks for any help.