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. 5 6 To save the existing data for restore later: 7 8 dd bs=1M iflag=fullblock count=8 if=/dev/sda of=sda.img 9 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. 13 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). 17 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). 22 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 26 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 30
