"USB Mass Storage Device" won't start

[Peegee]

The actual device in question is an IDE to usb device (like to attach an ide hdd or cd rom to usb port). I have one that works fine, but when I plug two in, I get problems. Ultimately I want 3 of these devices (two extra hard drives and a dvd rom drive) to work, but for the time being I'm working one at a time.

Computer management doesn't show extra drives, so I checked device manager. There's a yellow "!" on the usb mass storage device icon and I can't repair it. The error code is 10 (This device cannot start).

Any advice?

edit: in other words, I'm trying to have 3 IDE hard drives at the same time. One is attached to the motherboard/power supply, and two are attached via USB port. One is failing to start).