In this case, the customer has run several large jobs and the size of their MGRUSERx.x folder has grown to Gigabytes in size. How do they reclaim that disk space?
1. Check the MGRx.x\system folder for any JOBxxxxx folders.
2. If those job folders exist, delete the jobs from PI Output Manager
3. Once the jobs have been deleted, ensure the JOBxxxxx folders no longer exist.
4. Find the MGRUSERx.x\virtuals\vdd folder and delete all of the contents of that folder. The folder itself should not be deleted.
UPDATED: March 16, 2015