In other words, you can use your favourite Beeb emulator to create blank images that can then be added to BEEB.MMB. It lets you browse the file and add disk images to the available slots. Looking at the weekend, the file is not editable using normal methods, but you can see from this post, there is a tool called MMBIMAGER, which you can find here. ST images we use in our Goteks etc, and can also be used for our BBC emulators. So, just to add a little regarding the TurboSPI, it uses a file called BEEB.MMB to store 500 disk images.
