Hardware

If so, they won't work under Vista. You'll need to download Vista-specific drivers.

If this is not the case, do your USB ports on Vista work with anything else? Check in Device Manager for errors on the USB ports.

I had this same problem. After 2 days of searching found info that may help.
info at:
http://tim.mackey.ie/VistaDriverProblemsFormacUSBHardDrive.aspx

Basic points are some bug in Vista. You have to delete some file and presto it should work.

Apparently there is some bug with Vista where you can get a corrupt driver cache file and if you delete it then it will solve all these problems.
The culprit file is called INFCACHE.1 and it's located in c:\windows\inf. I discovered this on a newsgroup post. This is the relevant parts:

"The solution to this annoying problem (I had it on one PC), seems to be to locate and delete the file INFCACHE.1, which may be corrupted and causing the problem. To delete this file, you will first have to modify its permissions so the users group can access it (right-click on the file->Properties->Security). INFCACHE.1 file. It's located at C:\Windows\inf (scroll down to the file). (Note: to see INFCACHE.1, you must set Windows Explorer to display hidden and system files)

When modify these system files, i usually find i have to take ownership first for my own user account, then add myself to the permissions with full control. then you can delete it, or rename it to X_INFCACHE.1, etc."

Hope it works.

Hi,
This exact scenario happened to me and I emailed tech support after scouring knowledge base - NO HELP!
Suddenly I wondered if I needed to set the device to share on the XP computer before the Vista computer would see it.
Yep - that was it!
No one knew from the manufacturer or in their FAQ!
Hope this is your solution, too.
Sarah