| 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 |
