Execute the following script to create a table-valued function and a stored procedure to list all drives with total disk space and free disk space. Note that the table-valued function "join"-ed with a CROSS APPLY in the sproc to obtain the final results.

USE AdventureWorks2008;

GO

/*

-- Turn on OLE automation if not on

exec sp_configure 'show advanced options', 1

go

RECONFIGURE

GO

exec sp_configure 'Ole Automation Procedures', 1

GO

RECONFIGURE

GO

*/

CREATE FUNCTION fnTotalDriveSpace

          (@DriveLetter CHAR(1))

RETURNS @Total TABLE (MaxSpaceGB money)

BEGIN

  DECLARE  @return INT, @fso INT, @GetDrive VARCHAR(16)

  DECLARE @drv INT, @DriveSizeinBytes VARCHAR(32)

  SET @GetDrive = 'GetDrive("' + @DriveLetter + '")'

  EXEC @return = sp_OACreate 'Scripting.FileSystemObject', @fso OUTPUT

  SET @DriveSizeinBytes = NULL

  IF @return = 0

    EXEC @return = sp_OAMethod @fso, @GetDrive, @drv OUTPUT

     IF @return = 0

       EXEC @return = sp_OAGetProperty @drv,'TotalSize', @DriveSizeinBytes OUTPUT

  EXEC sp_OADestroy @drv

  EXEC sp_OADestroy @fso

  INSERT @Total values (

          (((convert(bigint,@DriveSizeinBytes)/  1024)/ 1024)/1024) )

  RETURN

END

GO

-- select * from dbo.fnTotalDriveSpace('C')

CREATE PROC sprocDriveSpaceInfo

AS

BEGIN

DECLARE @Drives TABLE ( DriveLetter char(1), FreeGB money)

INSERT @Drives (DriveLetter, FreeGB)

EXEC xp_fixeddrives

UPDATE @Drives SET FreeGB = Floor(FreeGB/1024)

SELECT

      DriveLetter,

      FreeGB=convert(int,FreeGB),

      MaxSpaceGB=convert(int,MaxSpaceGB)

FROM @Drives d

CROSS APPLY dbo.fnTotalDriveSpace (d.DriveLetter)

ORDER BY DriveLetter

END

GO

EXEC sprocDriveSpaceInfo

GO

Results: