How to free up unlabeled 100MB space on HDD

[TaskMaster]

i have a reformated HDD that previously contained WinXP. When I installed Win 7 couple of years ago I retained the old drive until I could remove other data from it. That has all been done. The drive has been reformatted, but used space is 100MB. I suspect it was set aside for Win 7 System Reserved space.
How can force that space to be freed?

 

[Layback Bear]

If you don't want anything on that drive wipe it.
http://www.sevenforums.com/tutorials/172617-secure-erase-wipe-definition-methods.html

http://www.sevenforums.com/tutorials/52129-disk-clean-clean-all-diskpart-command.html