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GeoDsp: Images to display the geometry as the BIOS has choosen to interpret it. Both images are intended to be written to the first ~8MiB of a raw device (ie /dev/hda, /dev/sda) and be over one large cylinder of 255*63 512-byte sectors in size. To save the existing data for restore later: dd bs=1M iflag=fullblock count=8 if=/dev/sda of=sda.img GeoDsp1S is a one-sector variant containing all code in one sector that is intended to test behavior with a typical MBR/partition table layout. A partition table should be written after writting an image. GeoDspMS is a multi sector variant intended to look like Syslinux installed on a file system on the raw device (as opposed to a file system within a partition). GeoDspMS can also be used to attempt to make the boot sector look like a normal file system's boot sector (ie FAT12/FAT16/FAT32). In order to do this, you must first save a portion the existing boot sector (the majority of the BIOS parameter block). dd bs=1 skip=3 count=87 if=/dev/sda1 of=sda1.bpb dd conv=notrunc if=geodspms.img of=/dev/sda1 dd conv=notrunc bs=1 seek=3 count=87 if=sda1.bpb of=/dev/sda1 dd bs=1 skip=3 count=87 if=/dev/fd0 of=fd0.bpb dd conv=notrunc if=geodspms.img of=/dev/fd0 dd conv=notrunc bs=1 seek=3 count=87 if=fd0.bpb of=/dev/fd0 Sample output: CHS 0081,FE,3F @CHS 0000,01,01:0000003F @CHS 0001,00,01:00003EC1 @EDD 0000003F:0000003E @EDD 00003EC1:00003EC1 D=EDD end The first line is the interpreted geometry per INT 13h AH=08h,DI=00h (in hex). The second line is the data value at the sector CHS 0,1,1 (indicating effective sectors per track). The third line is the data value at CHS 1,0,1 (indicating effective heads per head count). The fourth line indicates the value read at LBA 63. The fifth line indicates the value read at LBA 16065. The sixth line indicates the final expected mode. Images created by the Perl variant up to and including 6.03 are off by one and shifted by one byte. In the above, the second line might read "00003E00" instead of "0000003F".
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