I figure I am out of my depth here, and any advice and assistance would be most welcome.
I am having a fair amount of success imaging 3.5in floppies. The BIG problem is the 5.25in ones, most of which I cannot read. I am using a few old PCs because I know that modern ones often have issues driving 5.25in drives from my experiences imaging my own PC ( not PC-98 ) disks. I have 5 or 6 drives of various makes which I have checked read properly on a couple of "reference" PC 1.2MB floppies. I have managed to image 2 or 3 floppies using these drives and Disk Image, but the rest just give immediate errors - sector not found etc. I am fairly sure they are HD disks - from the labels and the packaging, and they do not read in a known-good 360k drive.
So what is going on ( I cannot believe the 6-8 disks I have tried are bad )?:
1. The disks are actually bad
2. I am stupid ( known to be true )
3. There is a non MS-DOS format I do not understand
4. I should be using some other program
5. They can only be read on a real PC-98
Then there is an 8-inch floppy with Supercalc on it - but we won't worry about that one LOL.