after four days of trying to make my usb stick work with my old motherboard bios i finaly managed to make it work
the physdiskwrite did not entirely work for me, the bios would freeze at detecting hdd phase.
so before “burning” the zs image on the usb stick i followed this tutorial so i could create partitions on usb stick
http://www.ghacks.net/2008/10/16/how-to-create-multiple-usb-stick-partitions/
after that i “burned” the zs image on the usb stick and from Disk Management (right click on my computer and manage) i deleted the first partition on the usb stick
after that i created a new partition which i formated fat
with winimage from here http://www.winimage.com/download.htm i opened the zs image file and selected the first partition
i then copied vmlinuz and initrd.gz on the first partition (the FAT one)
i installed Syslinux downloaded from here http://syslinux.zytor.com/wiki/index.php/The_Syslinux_Project
and created on the FAT partition a Syslinux.cfg containing this code
default linux
prompt 1
timeout 1
label linux
kernel /vmlinuz
append initrd=/initrd.gz ramdisk_size=131072
and i booted from the stick and didn’t freeze anymore
i had to to this because my bios has strange booting devices, such as USB HDD, USB FDD, USB CDROM, USB RMD FDD and USB RMD HDD
the option that worked for me was USB RMD FDD
hope somebody find this usefull and that i earned my activation key 😛
cheers