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Member "syslinux-6.03/diag/geodsp/README" (6 Oct 2014, 1286 Bytes) of package /linux/misc/syslinux-6.03.tar.gz:

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    1 GeoDsp: Images to display the geometry as the BIOS has choosen to
    2 interpret it.  Both images are intended to be written to the first ~8MiB
    3 of a raw device (ie /dev/hda, /dev/sda) and be over one large cylinder
    4 of 255*63 512-byte sectors in size.
    6 To save the existing data for restore later:
    8 	dd bs=1M iflag=fullblock count=8 if=/dev/sda of=sda.img
   10 GeoDsp1S is a one-sector variant containing all code in one sector that
   11 is intended to test behavior with a typical MBR/partition table layout. 
   12 A partition table should be written after writting an image.
   14 GeoDspMS is a multi sector variant intended to look like Syslinux
   15 installed on a file system on the raw device (as opposed to a file
   16 system within a partition).
   18 GeoDspMS can also be used to attempt to make the boot sector look like a
   19 normal file system's boot sector (ie FAT12/FAT16/FAT32).  In order to do
   20 this, you must first save a portion the existing boot sector (the
   21 majority of the BIOS parameter block).
   23 	dd bs=1 skip=3 count=87 if=/dev/sda1 of=sda1.bpb
   24 	dd conv=notrunc if=geodspms.img of=/dev/sda1
   25 	dd conv=notrunc bs=1 seek=3 count=87 if=sda1.bpb of=/dev/sda1
   27 	dd bs=1 skip=3 count=87 if=/dev/fd0 of=fd0.bpb
   28 	dd conv=notrunc if=geodspms.img of=/dev/fd0
   29 	dd conv=notrunc bs=1 seek=3 count=87 if=fd0.bpb of=/dev/fd0