People often overlook using defrag.exe which is quicker to get to and for people like me easier than going through the Microsoft made GUI for disk defragmenting.
defrag <volume> [-a] [-f] [-v] [-?] [-b]

volume drive letter or mount point (d: or d:\vol\mountpoint)
-a Analyze only

-f Force defragmentation, even if free space is low. Normally it requires 15% of your drive to be free space.

-v Verbose output

-? Display this help text

-b Defrags the boot files only.

This will be leading up to the automated defrag... I'll write this in full detail soon.

CTRL+C at the command line will cancel the defragment process.