Thanks for your comments but I think I was not clear:
This CD-RW was used exclusively as a large floppy. So it's only UDF, nothing else in there... only 1 session.
phil I did check the properties of all files/folders on the CD-RW. It gave me only 174MB. There are no hidden sessions, etc. Curiously Isobuster reads 576MB. So I know that the data is still there. In fact I can see all the files in Isobuster. The problem is because I don't have a licensed version (and I dun want to buy one just for one CD-RW recovery) I cannot extract the data.... some of the larger folders have a black cross besides them. I understand that it means the file is fragmented over the entire disc's file structure. Are these recoverable?
I'll try CDRoller. Thanks! In the meantime, any other help/suggestion as to what else I can do to recover the data would be greatly appreciated.