On Jan 15, 2016 8:32 AM, "Robo58" <rob...@optonline.net> wrote: > The 8" SD diskettes are standard IBM format (I > believe 3740 physical format) 26 sectors.
Almost all SD 8 inch use that physical format, though there are some oddball formats like OSI. Similarly almost all 8 inch SD CP/M disks use the same logical (filesystem) format, because that was THE standard for CP/M interchamge. > I believe the 8" DD follows the > same 3740 physical format 3740 is specifically SD. By definition, DD *must* be a different physical format. In most cases, DD uses IBM System/34 format, though as with SD there are some oddballs. The big problem is that there is no standard for CP/M logical format on DD (or a zillion "standards", depending on your definition). Usually when I've been faced with an unknown CP/M format, I've figured it out "by hand" using a sector editor, because back then I didn't have any of the fancy interchange programs that were sold.
