Script to check Disk IO

select db_name(database_id) as DatabaseName, file_id,io_stall_read_ms,num_of_reads
,cast(io_stall_read_ms/(1.0+num_of_reads) as numeric(10,1)) as 'avg_read_stall_ms'
,io_stall_write_ms,num_of_writes,cast(io_stall_write_ms/(1.0+num_of_writes) as numeric(10,1)) as 'avg_write_stall_ms',
io_stall_read_ms + io_stall_write_ms as io_stalls,num_of_reads + num_of_writes as total_io,cast((io_stall_read_ms+io_stall_write_ms)/(1.0+num_of_reads + num_of_writes) as numeric(10,1)) as 'avg_io_stall_ms'
from sys.dm_io_virtual_file_stats(null,null)
order by [DatabaseName] desc