IO Reads and Writes in SQL Server

Objective: To find IO reads and writes from SQL Server 2005
select *
from sys.dm_io_virtual_file_stats(NULL, NULL)
/*--what files are taking up the most IO*/
select db_name(mf.database_id)as database_name,mf.physical_name,left(mf.physical_name, 1) as drive_letter,
vfs.num_of_writes,vfs.num_of_bytes_written,vfs.io_stall_write_ms,mf.type_desc, vfs.num_of_reads,vfs.num_of_bytes_read,
vfs.io_stall_read_ms,vfs.io_stall,vfs.size_on_disk_bytes
from sys.master_files mf
join sys.dm_io_virtual_file_stats(NULL,NULL)vfs
on mf.database_id = vfs.database_id and mf.file_id=vfs.file_id
order by vfs.num_of_bytes_written desc