>I am trying to use the DriveInfo() class to get some information from a UNC drive. However, this doesn't seem to be possible. I keep getting:
>
>Object must be a root directory ("C:\") or a drive letter ("C").
>
>How can someone use DriveInfo() on a UNC drive?

Michel,
I was too surprised it fails with UNC paths. Documentation doesn't say that (only says it wouldn't work with deviceid but UNC should not be considered as a deviceid). Probably a bug or a feature:) Under the covers it might be calling System.Management.ManagementObject with a ManagementPath to win32_device.LogicalDisk. If that's the case then it'd fail where WBEM classes are not registered on remote computer. I expected that to map to win32 services like GetVolumeInformation, GetDiskFreeSpaceEx etc which do work with UNC paths.
Anyway I think this one and other GetFreeSpace code piece in C# was related. If so then you could use this:

Imports System.Runtime.InteropServices

Module getdiskspacesample

   Public Declare Function GetDiskFreeSpaceEx Lib "kernel32" _
     Alias "GetDiskFreeSpaceExA" _
         (ByVal lpRootPathName As String, _
          ByRef lpFreeBytesAvailableToCaller As UInt64, _
          ByRef lpTotalNumberOfBytes As UInt64, _
          ByRef lpTotalNumberOfFreeBytes As UInt64) As Integer

Sub Main()
  
        Dim freeBytesToCaller As UInt64
        Dim totalNumberOfBytes As UInt64
        Dim totalNumberOfFreeBytes As UInt64

        Dim rootPathName as string = "\\poseidon\c$"

        GetDiskFreeSpaceEx(rootPathName, freeBytesToCaller, totalNumberOfBytes, totalNumberOfFreeBytes)

        System.Console.WriteLine( "Free Bytes: " &  freeBytesToCaller.ToString() )
        System.Console.WriteLine( "Total Bytes: " &  totalNumberOfBytes.ToString() )
        System.Console.WriteLine( "Total Free Bytes: " &  totalNumberOfFreeBytes.ToString() )


end sub
end module

PS: \\poseidon\c$ exists on my my domain.
Cetin