Hello List 1.) Just to be sure: dd if=/dev/zero of=/dev/sda1 will overwrite any data on sda1 with zeroes, but leave sda2, sda3 and the mbr untouched? 2.) To backup my mbr I do dd if=/dev/sda of=/flopyy/mbr.sda bs=512 count=1 and to put it back dd if=/floppy/mbr.sda of=/dev/sda bs=512 count=2 Will this be enough to get lilo back after windos new install? 3.) During all this dd'ing, /dev/sda must be *completely* unmounted? Thanks joerg