I found the problem (by accident).

When I was in a Windows XP session, I decided to do a Norton Disk Doctor
check on the drives (C: and D:). With the D: drive being the one in question
here!

I couldn't perform this check, until I disabled Norton's GoBack. Well, I
haven't "enabled" Norton GoBack yet. I plugged in the removeable SATA HDD
rack containing Windows Vista Ultimate and booted up. I wanted to find
something on the C: drive, so I went into Windows Explorer. Lo and
behold....the D: drive is now showing!

Why? I am assuming that the Norton GoBack has specific descriptors that
only it (GoBack app) would recognize --- effectively hiding this drive from
Windows Vista. I think that if I installed Norton GoBack here (in Vista) and
had it set for both drives (C: and D:) that I WOULD be able to see it here.

Anyways, thanks for the help, everybody.

"Cari (MS-MVP)" wrote:
[color=blue]
> Partition and format the drive!
>
> Right click on My Computer, select Manage. On the following screen, click
> on Disk Management. It will show up on the right hand side of the screen
> from where you can partition it, format it and assign it a drive letter.
> Now it will show up in Windows Explorer. No version of Windows can 'see' an
> unformatted drive.
> --
> Cari (MS-MVP)
> Windows Technologies - Printing & Imaging
> [url]http://www.coribright.com/windows[/url]
>
> "Lakesidezx" <lakesidezx@nowhere.net> wrote in message
> news:A12D5C7E-59F4-4AD0-B747-B8C28D2C7AD0@microsoft.com...[color=green]
> > Hello,
> > I've added a new sata II hard drive to my windows vista home premium
> > installation. When I started up vista, I got the little bubble in the
> > lower right portion of the screen telling me that new hardware was
> > detected and that drivers were beign installed.
> >
> > All went fine.
> >
> > When I go to device manager, the new hard drive shows up there, but in
> > windows explorer it's nowhere to be found.
> >
> > What do I need to do to be able to see this drive and use it in windows
> > vista.
> >
> > Thanks,[/color]
>
>[/color]