removed unused struct
Merge pull request #3 from jwhonce/wip/persistent_disks

WIP Infrastructure - Remove binary from repository
Merge branch 'persistent_disks' into pd_dev
added sections for DiskController and formatting options
Merge pull request #4 from markturansky/pd_dev

Pd dev
more docs...
Merge pull request #5 from markturansky/pd_dev

more docs...