I DIYed a USB hard disk, 40GB in size, and it supports USB 2.0. My motherboard is an 845PE model and also supports booting from a USB hard disk. I have already divided this USB hard disk into three partitions, the first one being a 500MB DOS primary partition. It can be used normally under DOS, Win98, WinXP, and other systems. But no matter what methods I try, I just can't use this USB hard disk to boot the computer in USB-HDD mode. Please, experts, help me out! See where the problem is. Thanks!!

