I have 2 4000T's that have the MPF920-E Sony floppy in them, I recently aquired some old PC's and one of them had a MPF920-E so I hooked it up to the 4000T and it wouldn't work. I looked closer at the drive and found a jumper by the power connector I think it was, a very small one that had to be changed to match the ones in my current drive in the 4000T. I did have to loosen the top cover of the drive to get access to it. I don't recall the exact settings at the moment just that I did change it to match and then the drive worked. The other thing that both towers have in common is that the floppy cable was modified in that it looked similar to the first link eslapion put up with the exception of the diode. This trick only allows for DD operation even tho the drives are HD. I also have one of the adapters (357) in a 4000 Mirage Pro tower from the second link eslapion put up but I am not certain of the type drive since I didn't look that close at it. I do like the idea of producing a board or adapter to hook onto the drive rather than hacking a cable to make it work. I am guessing that this is how Amiga Tech. did things was to come up with a cheap fix to get a drive working in the later 4000T's.
