I own over 4k titles in physical copies. So probably closer to 5-6k discs. As the other person said…backups. I’ve already found a few degraded discs as I’ve been working through.
Pretty much everything in the basement is some variant of linux. Couple more boxes(not pictured) higher in the rack that are just recycled desktops in rack mount cases. Some of the other stuff is windows because of the software being used. I use Mac stuff at work cause that’s what they provide. I don’t really care what OS. I just need it to work and the quickest way for me to get whatever it is done. I’ll reformat stuff to whatever when this project is done and I move on to the next.
The LG drive in my photo(looks like the top drive on yours) can take custom firmware that allows them to be region free and add the ability to rip 4K disks. Can’t actually play them as that requires decryption chips to be in the drive but it makes for a MUCH cheaper 4k ripping drive than a true 4k drive.