Ahh, so it could just be that they choose not to format the blocks above a certain number on some smaller disks. That would make sense, as it seems like it completely looses sync when it happens, and not all games will necessary need to be using all the ROM / RAM blocks. I'll have to look into the Everdrive USB thing. I don't have the USB port on mine yet, but I was going to add the chip for that anyway. Krikzz has that example code for programmers as well (like Marshall's API guide), so should be possible. (I can see why Marshall went with CF card on the 64drive though - it's a fair bit easier to access the sectors rather than messing with the SPI stuff on SD cards.) I'm a bit busy with the FPGA stuff atm, but really happy you guys finally got this working reliably and have already dumped a few disks. I will have to catch up with you all on IRC soon so we can look into hardware emulation of the 64DD again. OzOnE.