sql 查询服务器硬盘剩余空间

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