Disk Management in Windows 2012 R2, where is it?

Solution 1:

Run diskmgmt.msc just like previous versions of Windows.

Solution 2:

It is really easy to get to by default. You will probably even be a bit annoyed you didn't notice it.

Simply right-click on the Windows logo button. Then start the Computer Management. Most of the other common tools you use for managing your system are also linked there.

right click windows.