[16:38] Searching for stand-alone Windows Updates and Hotfixes
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and the Quality of the GDR updates is also bad. The last months a lot of update were pulled because of issues (this month Silverlight, KB3004394 (December 2014 update for Windows Root Certificate Program in Windows) and Rollup-Update for Exchange Server 2010 SP3 (KB2986475)). So the testing was not as good as it should. Also an Office Update causes macro issues
[29:36] Disk thrashing and what is difference between disk thrashing and disk I/O.
Run Resmon and look if the disk Queue at Init is > 10. this is bad and Shows HDD slowdowns
btw, the ntdebugging Team wrote a blog post about disk perf: