ID is not necessary for adding games.
Your problem is most likely the filename of the game. Shorten it and make it one worth with only letters as characters. That worked whenever I got the Unable to open disc file error (or make sure the directory it's in has no spaces)
Are you SURE that the location of the file AND wbfs_win.exe/your wbfs gui has no space in ANY of the folder names?
Also, I really don't know what the RHAE is for. I don't see how that is necessary >_>
They can be very large. 4GB won't even be enough to hold a single game in some cases, so you definitely want more than that. I use 200GB for mine, I've heard up to 500 and 640GB
What operating system are you using?
I am using XP and was getting the Bad Magic error until I assigned a drive letter, then it started working. Again, I know it sounds obvious, but make sure you are using the correct drive letter for the WBFS partition.
It's probably not necessary for many people. NTSC will probably work too, and you may not need to format it at all. However, some people (including myself) were unable to add games via Windows until formatting it to FAT32 and then into WBFS. It's rare that you'll need to, but it only take a...
Yes, USB loader will tell you what size each partition is on the drive, so you can distinguish that way.
Also, sorry again about hosting that. I guess I missed that sticky. Anyway, it's gone now.
This is fairly simple guide to getting USB Loader v1.1 to work. Pretty much anyone should be able to follow it, and I hope it works for you.
References
USB Device Compatibility Wiki
USB Game Compatibility Wiki
Everything you need can be found ->HERE
Using a Western Digital 1TB My Book Essential and it's running perfectly. (200GB partitioned for Wii use)
SSBB Took approximately 25-28 minutes to install, Zelda around 4.
Games run very quickly.
http://www.amazon.com/Western-Digital-Esse...N/dp/B000VZCEUI - $118 on Amazon.
@SylverReZ, I also heard one of the Prince of Persia games was so unfinished that it required the "24/7 online" drm so a puzzle could be done and the game could be finished. And that when the Ubisoft servers were closed the (cracked) game was impossible to finish or something like that
I like that games can be fixed after the fact, hate that it's being abused via beta tests... And DLC... I was a 7800 owner back in the day and loved Impossible Mission, turns out I couldn't beat it because it was actually impossible lol