Having looked at some of the discussions circulating before, I tried the recipe that Bruce Bryne suggested but have hit a "missing operating system" problem. Below are the steps I took: a. mkdosfs /dev/sdc1 b. mount /dev/sdc1 /mnt/stick c. cp rhas3u2/isolinux/* /mnt/stick where rhas3u2 is the RHES AS 3 update2 CD mount point d. cp /mnt/stick/isolinux.cfg /mnt/stick/syslinux.cfg e. cp /rhas3u2/images/pxeboot/initrd.img /mnt/stick/ f. umount /mnt/stick g. echo "mtools_skip_check=1" >> /root/.mtoolsrc h. syslinux /dev/sdc1 When I took this memory stick to another PC, I can see the hard disk device (OTi6828) at the BIOS level - Boot option. But after selected the boot option, save and reboot, the system reports: PXE-E61: media Test failure check cable PXE-M0F: Exiting Intel Boot Agent missing operating system If I then reboot, the system hangs at the initial memory test. After reinserting the memory stick, the system continues the memory tests, but later reports missing operating system error again. It seems to suggest USB booting is now always possible. Does anyone know what is it required in order to support USB memory stick booting? -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list