Den m?n 8 feb. 2021 kl 20:39 skrev David Schmidt via cctech < cctech at classiccmp.org>: Thanks! I will have a look. After sending my message I did some hard drive archeology and found the dmklib I downloaded five years ago. There were some adaptations to handle RX02 format and it worked quite well. At least when the disk has been read error free. However the version of cw2dmk (4.5) I used had a feature that joined sectors from multiple reads. That should be quite useful to try to stitch together many reads worth of data into one full error free track. But for some odd reason cw2dmk v 4.5 joined sectors which were FM encoded, even though I explicitly stated I wanted only RX02 encoding, resulting in a track with both FM and RX02 (mixed FM and MFM) sectors. I cannot really understand how that could result in a good read and a matching CRC? Now I see that there is a version 4.6 of these tools that I probably should try instead. Perhaps the join feature works better in that version? So cw2dmk reads FM disks and doubles every byte? Resulting in 256 bytes sectors in FM mode, right? /Mattis