I have two hard drive enclosure devices (IDE) and a new Western Digital 160MB internal drive that I've tried to install in each. When I connect the USB enclosure, Windows tells me that a USB mass storage device has been installed, and usually (but not always) I can see in Device Manager that it recognizes the device as containing a Western Digital drive. However, I never get assigned a drive letter and can't access the drive through My Computer, so there's no way to put data on the device. This is true for both USB enclosures. A separate USB external drive (integrated, not a standard internal drive installed in a separate enclosure device)I own has no problem being recognized and assigned an additional drive letter. Please help.