[dockles]

I have a hard drive installed in an external USB case with its own power supply. I have used this unit on a Win XP machine as an external drive, formatted as NTFS, but now want to use it on a Vista machine for backup purposes.
However, I cannot see the drive in Explorer. I can see it in Device Manager and when I unplug and replug the unit in, Vista makes the usual noise indicating that a connection/disconnection is being made. I have tried View->Refresh to no avail.
Any ideas/suggestions?

BTW: USB flash drives work normally

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That sounds like a quirk with VIsta. There isn't a yellow or red icon over the device in Device Manager is there? If so, look for another driver online. If not, I still might check to see if there's an updated VIsta-compatible driver online. Seems that Vista tries to be helpful by using a default library of drivers that it comes with. Makes life easier most of the time, but maybe not in this case.

[gclipse02]

That sounds like a quirk with VIsta. There isn't a yellow or red icon over the device in Device Manager is there? If so, look for another driver online. If not, I still might check to see if there's an updated VIsta-compatible driver online. Seems that Vista tries to be helpful by using a default library of drivers that it comes with. Makes life easier most of the time, but maybe not in this case.