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.