I am administering an SBS 2003 with SP2.
The boot drive is C: and is accessible through My Computer, Explorer etc.
The volume shows up in Disk Management, but has no drive letter. If I try Change Drive Letter and Paths... from the context menu, it comes up with the error:
"The operation did not complete. Check the System Event Log for more information on the error. Close the Disk Management cnosole, then restart Disk Management before retrying the operation."
There don't seem to be any related events in the System log of eventvwr. Restarting the disk management console has no effect.