www.makemkv.com

Or the data is obfuscated intentionally for a reason.... Which it is.

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Well, joke's on both of us. After hours of research, it turns out that almost ALL of that stuff is unneeded. The only thing that MakeMKV truly needs from discatt.dat is the VID. Here's ...

"0x03000100 //Disc Standard :: BD Disc Information -> No idea what this is exactly"

I've taken a deeper look. The BD Disc Information is obtained by MakeMKV through an SCSI command ADh ("READ DVD STRUCTURE"). The corresponding response from the drive is cut by MakeMKV to save space, with a now ...

It won't work. They are not "transferable" even if you "update these 4 items."

I don't get it. If I can synthesize a discatt.dat for one disc from that of a different disc, and they are exactly the same as if I had generated the file with MakeMKV, what wouldn't work? I don't understand what you ...

Look at the source code if you want to see the format. But knowing the format isn't going to help you. You can't just create one.

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OK folks, I've looked at the MakeMKV source code, specifically these files:

libdriveio/inc/driveio/driveio.h (typedef enum ...

You don't really have a choice. The discatt.dat file format is not documented, and AFAIK its contents are obtained from the disk using LibreDrive. Only MakeMKV can generate it.

Maybe not right now, but Mike might be able to document the format. A lot of the content seems irrelevant for ...

MrPenguin wrote: Wed Dec 31, 2025 12:27 pm The obvious answer would be to put your original disks into your drive and use MakeMKV to generate a new discatt.dat for each via its "disk backup" feature.

Agreed, but I have 600+ discs imaged already and can't go through the pain of re-inserting them all.

Hello! I have a collection of encrypted ISOs of regular and of 4K blu-rays. BEE discs were imaged with LibreDrive, i.e. the images have bus encryption removed. I have VID, MK and VUK of all of these images. Is there a way I can generate the discatt.dat file so that MakeMKV can work with these images ...