I have a new PC without optical drive so I wanted to install from a USB stick. I found neither of the methods listed in the Scientific Linux website worked. However, a read of parts of the script livecd-iso-to-disk led to a working method. The problem is that the script cannot find /EFI/BOOT/+(BOOT|boot)?*.conf for the good reason that the file required is actually called grub.cfg. Editing that and isolinux/isolinux.cfg by hand (replacing the LABEL=... bits by UUID=... for the UUID of the USB stick) worked fine. I suggest that the instructions and/or the script be updated to reflect the change of name of the required configuration files Malcolm MacCallum