IMGburn file size too large

I’ve been trying to make copies of some BD rips I have, onto Informedia
BDRE discs. Dvdfab says they don’t need compresion and will burn them, but goes through it’s “ripping” process first - to remove protection?
THEN it burns to IMGburn fine.
If I try to use IMGburn right off, it says the file is too large.

Win7 says the size is 23,940,289,377
IMGburn Size: 23,940,289,377 bytes
Fab says 21.024 GB

Apparently I can format the disc, then it will work in IMGburn, but that takes as much time as letting fab do it’s thing.