Well, I didn't quite understand how Xbox 360 works with games. Honestly I thought it was like the PS3 where you could use PS3splitter, or Wii isos using wii backup manager. Yeah, I should had been more specific.
For now, I am just playing a few JRPGs and Infinite Undiscovery works nicely. Just had to use Xbox Image Browser, extract all files, and copy them to the usb drive, and boot them from xexmenu and it worked.
I didn't specify what I had, so sorry if I confused you. I'm on a tight budget now, so all I have are my USB HDDs, until I can upgrade my harddrives, I guess I'll stick with USB which isn't too bad for me. Thank you for telling me about this program. That's all I needed to do.