I've been burning .ISO images of my GAMES, and I store all of my images on an external HDD. My collection of media is getting pretty large, but I'm still learning about this stuff.

Okay, I have a lot of questions. I'm wondering what is the best type of file I could save my disk images in. I know ISOS are pretty popular, but I've read they can't be used for multi-track or audio CDs. I would like all my images to be as complete as possible. I don't really care if they would take up a whole ton more space than another image type. I don't think file size is really an issue. I want to try and make as exact a copy as possible.

.BIN/.CUE I realize that all the important data is stored in the .BIN file so if I used .BIN/.CUE files is the .CUE file really necessary? Would I have to keep it with the large .BIN images? It would be nice if I could just have one large file. Wikipedia says that it is an exact copy. Then why doesn't it always circumvent copy protection, etc?

.IMG Wikipedia also says that an .IMG file is a raw dump. Doesn't that also mean it should be like an exact copy?

I remember useing CLONECD to make some .IMG images or something, but they came with all these other files. SUB channel data or something? Maybe a .CUE file too, I don't remember. What is all that for?

.UDF I don't know much about this format. Is this only for DVDs? Would it be a good format for my games that are on DVDs?

I'm thinking about using the .BIN files because they are supposed to be an exact copy of the data. So can I store audio CDs or games or anything in a .BIN file? Would I be able to mount an .BIN of an audio CD in the DaemonTools program and have it work properly just like I had put it into the physical disk drive?

Another sort of unrelated question...

I made a .BIN file of Tenchu: Stealth Assassins for the PSX. I have a PSX emulator on my computer. When I ran the .BIN file it worked fine, but then I used MagicISO to convert it to an .ISO. The .ISO would not run properly, but I'm pretty sure the emulator supported .ISO files. The emulator said something about "iso9660: incorrect header." Why do you think it wouldn't work?