15 Jan
2016
15 Jan
'16
2 p.m.
On Jan 15, 2016 8:32 AM, "Robo58" <robo58 at 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.