It's the same format use by this script but I can't test it with the provided sample:http://aluigi.org/bms/edge_of_nowhere.bms
It was difficult to find the script, luckily I found the "1TAD" magics in the big archive and found them in the script too.
Heya, I tried using quickbms with the edge_of_nowhere.bms on some Ratchet & Clank PS4 files on the gxxsxxx archives, and it made a bunch of numbered .dat files. That aside, it also couldn't handle the largest one which tots up at 3.1GB. I've uploaded it here
if you'd like to take a look at it?