I created an bootable Acronis DVD with Acronis Ti Echo Workstation. After booting the computer with DVD, I tried to restore an Acronis Image onto a USB hard disk, but failed. When I enter the BIOS, i can see the usb drive in the list of boot devices. But i can't select the USB drive as target for the image restoration. It is just grayed out. But starting Windows XP, I can select the "empty" USB hard disk and restore the image. What is wrong with bootable DVD? Or what is wrong with the USB hard disk? Thanks for your help!