SBS 2008, USB drive formerly used for backup apparently not released fully

Am using the built-in Windows Server Backup in SBS 2008.  Using the Backup console, I released an external usb drive from the list of configured backup drives.  

Since then, I've used the drive as a sort of utility storage device, and have transferred a number of large files from Win 7 workstations.  But when I attach the drive to the sbs box, Explorer won't recognize it, thus I can't access those files when the drive is attached to the server.  I guess the server didn't fully release the drive?

Suppose I should have reformatted the drive straight away when I attached it to a win7 box, but as I I was able to use the drive successfully, assumed I didn't need to.  Granted, I could transfer the many gigs of data on the usb drive somewhere temporarily, format the drive, then transfer back.  But iit's enough of a pain that I'd prefer not to.  Besides, my curiosity is piqued now as to what's going on and whether it's possible to get this drive into a usable state as-is.

Thanks.
thatnameAsked:
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Rob WilliamsConnect With a Mentor Commented:
SBS "marks" the drive as a backup drive and once done though it will show up in disk manager it will not show up in explorer. You need to delete the partition and reformat. I am surprised Win7 could use it, but then again I have never tried that
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thatnameAuthor Commented:
Thank you RobWill.   Yes, I was surprised, too, that Win7 could use it!  But since I was able to write files straight away and assumed it was good to go as an all-purpose usb mass storage device.

Anyway, lesson learned & thanks again for your comment.
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Rob WilliamsCommented:
Very welcome.
Once SBS "takes a hold" of a storage device for backup purposes it becomes a dedicated device until reformatted.
Thanks thatname.
Cheers!
--Rob
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