One other change that may be needed is that not all the Data presented is an offset, some cleaning may be required with
DELETE FROM Iops WHERE SUBSTRING(Detail, 1, 6) <> 'Offset'
where access appears to be denied otherwise the SUBSTRING section will fail on occasions.
or adding in another filter for Detail beginning with "Offset"
This may have been caused as I added in .ldf files also. Log files shows a very marked contrast to Data mdf files as the block size changes a lot and the tempdb can write a large amount of data out in quite large blocks for database.