hdd image for PXE boot

dd if=/dev/zero of=kido bs=512 count=20160 --> S63*H16*C20

fdisk -u -C20 -H16 -S63 kido
  c--> DOS Compatibility flag is set
  n --> p --> 1
  t --> b
  a --> 1

ms-sys -9 -f kido
losetup -o32256 /dev/loop0 kido
mkfs.msdos -F 16 -n "KIDO" /dev/loop0
ms-sys -f -6 /dev/loop0
hexedit /dev/loop0
  15h-F8
  18h-3F (S63)
  1Ah-10 (H16)
  1Ch-1Dh (3f 00)
  24h-80

cp command.com  drvspace.bin  io.sys  msdos.sys to image

losetup -d /dev/loop0

mount -o loop,offset=32256 kido hdd --> 32256 = 63*512

shrink down image size by gzip
  gzip kido
  mv kido kido.img

PXE config

  label dos

    kernel /tool/memdisk

    append initrd=/tool/kido.img harddisk c=20 h=16 s=63

mbr --> master boot record (at offset 0)

boot program (at offset 32256)

ms-sys --> http://ms-sys.sourceforge.net/

hexedit --> http://rigaux.org/hexedit.html

f2 to save

f10 to exit

ref=http://www.richud.com/wiki/Ubuntu_Create_Hard_Drive_Image