Compared to Windows 8, Windows 2012's Task Manager has Disk and Network columns disabled.
- Why are these columns disabled?
- How can one activate them, especially the Network column?
If you need to see the metrics, you can use Resource Monitor.
I found next post (at russian), where described how to patch taskmanager for missing columns (and direct link to patched at end of post). http://habrahabr.ru/post/160161/