Hello, I am trying to make a bootable device for Acronis image restoration. I want to use a usb device. Is there any difference in booting functions for a USB FLASH DRIVE, USB HDD, or USB CD-ROM? This will be used to restore 40 computers with the same image. These stations do not have an internal cd-rom or floppy drive. Acronis can build bootable cds and i already have one. is there any special formating required to use a flash drive or hdd via usb to load the restoration utilty?