DECLARE @tb1 Table
(
drive varchar(20),
[MB 可用空间] varchar(20)
)
INSERT INTO @tb1
Exec master.dbo.xp_fixeddrives
select drive , CAST( CAST((CAST([MB 可用空间] as decimal(9,2))/1024 ) as decimal(9,2)) as varchar)+‘G‘ as 剩余空间 from @tb1
原文：http://www.cnblogs.com/yangdunqin/p/sqldisk.html