Now THIS is weird... (DC Crazy Taxi - Self Booting?)

OK, I've made DOA2 self-booting and dummied at home (using the ECHELON SB files, which I personally think are great, and actually work, with a bit of effort), and it worked OK. So when I got Crazy Taxi, I thought I'd do the same to that. OK, so it took up 73:59 mins, so I'd need an 80 minute - doesn't matter. When I check the disc properties, it shows up as 1 session, ISO 9660 format, with 650 MB taking it up. But copying the files results in a measly 100 MB - ?? I figured I'd make a RAW .BIN image, and convert this to ISO, and use ISOBuster to extract the files, but I don't have enough HD space (d'oh!), even though it says there's 2.7 GB free...

What's the basic problem? I can make them self booting (I won't bother dummying 3 minutes), I just need to get the files over to the HD (not just 100 MB out of the actual 650 MB). Before you ask, no - there's no CD-DA, and it's single-session. Oh, and the RAW .BIN image also took up around 650 MB...

HD space won't be a problem, if I can figure out how to go it!!!