Getting Available Server Disk Space (Total Size / Free Space) SQL Query

SELECT distinct(volume_mount_point),
total_bytes/1048576 as Size_in_MB,
total_bytes/1048576/1024 as Size_in_GB,
available_bytes/1048576 as Free_in_MB,
available_bytes/1048576/1024 as Free_in_GB,
(select ((available_bytes/1048576* 1.0)/(total_bytes/1048576* 1.0) *100)) as FreePercentage
FROM sys.master_files AS f CROSS APPLY
sys.dm_os_volume_stats(f.database_id, f.file_id)
group by volume_mount_point, total_bytes/1048576,
available_bytes/1048576 order by 1