When trying to backup the HD on my new PC with True Image, it failed to reboot with the ntldr missing error. On investigation by removing the external USB HD, the PC rebooted OK. Even on a normal boot up with the USB drive connected, the PC failed to boot. The new PC has a 200 gig SATA HD installed and there does not appear any settings in the BIOS to allow the PC to boot with the USB drive connected. My old PC with IDE drives had the USB drive permanently connected and always booted up without any problem. Is this a known issue with SATA Drives? as I have no previous experience with them. Peter.