Reply 20 of 29, by mR_Slug
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I've never had any compatibility problems with using 1.44MB drives in place of 720KB drives either. 5.25 drives are another kettle of fish. Here is what i would recommend to make a boot floppy.
1. Wipe a 1.44MB disk with a magnet then tape over the density hole. Or just get a 720K disk.
2. Format it with "format a: /s" then try to boot it in the system you made it in. If you get this far, you know you have a working 720K boot disk.
3. Then try it in the XT.
IIRC some model M's have auto sensing and can do XT and AT. Though some probably can't.
Not sure what floppy controller you were using but an AT IDE controller will never work on an XT. It needs the 16-bit bus. The floppy controller part of it however should work fine in an XT. As already stated it wont be able to do HD 1.44MB disks.