I am guessing the 5.25" image you are using is the same as this one? https://vintagecomputer.ca/files/Nabu/disk_images/NABU_5.25_DSDD_CPM_User_Boot.a2r
Any chance you have a Kryoflux? You could also try this one: https://vintagecomputer.ca/files/Nabu/disk_images/NABU_5.25_DSDD_CPM_User_BootKryoflux_RAW.zip
That would rule out image issues as I have used these, made the images, wrote them out and re-tested them.
Yes, that worked fine. The diskette I created boots and verifies. No hangs. However, when I do a flux image of that diskette on the Applesauce it's unable to read valid MFM data from a couple of the inner tracks. I did notice that the 5.25 images had two extra cylinders (4 tracks) on them - but those were not the ones with the read issues. Some timing oddness, perhaps?Interesting. Now that you have that, you can always connect the 5.25" and Gotek and make a real diskette via the Nabu from Gotek to floppy drive.
For whatever reason, all the 5.25" flux capture files have two extra tracks of garbage at the end. I believe this is responsible for some of the issues I've experienced. If I read the original HFE into the Applesauce application and write it back out with the extra tracks trimmed it boots just fine. I have prepared the 5.25" HFE, A2R and RAW images without the bogus tracks in case anyone else gets bit. Unfortunately (and, as usual) they are too large to upload here. I'll send them privately to @snuci and he is welcome to make them available to others.
This can be done but it takes a bit of effort, basically you first need to convert the flux/hfe to a sector image add the files with cpmtools. Then convert the sector image back to a kryoflux stream and copy the track 0 files from the original kryoflux stream into your converted stream. Now you can take that and convert it to hfe and it should have the correct data on track 0 to recognize the disk type.I thought I saw a posting from Larry Kraemer regarding proper cpmtools diskdef (?). That brings up a catch-22, though. Since cpmtools works only against sector data images, how can one use it to add files to an image that will then be properly recognized by the NABU?