MS SQL 記錄 Logical Disk Size

要如何將系統磁碟空間，記錄在資料庫中，語法如下。
IF NOT EXISTS
   (SELECT * FROM [tempdb].sys.objects
     WHERE object_id = OBJECT_ID(N'[tempdb].[dbo].[logicaldisk]')
       AND type in (N'U'))
BEGIN
   CREATE TABLE tempdb.dbo.logicaldisk(
                 line nvarchar(1000)
            ) ON [PRIMARY]
END
ELSE
    TRUNCATE TABLE tempdb.dbo.logicaldisk;
      INSERT INTO tempdb.dbo.logicaldisk (line)
        EXEC xp_cmdshell 'wmic logicaldisk get size,freespace,caption';
      DELETE FROM dw.dbo.usage_disk
       WHERE CONVERT(VARCHAR(10),collecttime,111) = CONVERT(VARCHAR(10),GETDATE(),111);
   WITH WhatIWant AS
      (SELECT SUBSTRING(line,1,CHARINDEX(' ',line)) Caption
           , SUBSTRING(LTRIM(SUBSTRING(line,CHARINDEX(' ',line),LEN(line))),1,CHARINDEX(' ',LTRIM(SUBSTRING(line,CHARINDEX(' ',line),LEN(line))))) FreeSpace
           , LTRIM(SUBSTRING(LTRIM(SUBSTRING(line,CHARINDEX(' ',line),LEN(line))),CHARINDEX(' ',LTRIM(SUBSTRING(line,CHARINDEX(' ',line),LEN(line)))),LEN(line))) TotalSize
        FROM tempdb.dbo.logicaldisk
       WHERE SUBSTRING(line,2,1) = ':');
 
 INSERT INTO dw.dbo.usage_disk
 SELECT GETDATE() collect_time
      , Caption
      , convert(bigint,[FreeSpace]) FreeSpace
      , convert(bigint,replace(TotalSize,Char(13),'')) Size
   FROM WhatIWant
  WHERE isnumeric(Totalsize) = 0;
 
   DROP TABLE tempdb.dbo.logicaldisk;