I have an old HDD that used to be my OS drive before I bought my SSD. Now I want to just use it as storage since I am booting from my SSD. I went into the disk management tool and tried to format the G:\ drive as it is named, but "format" is not selectable. I googled and it seemed that other people had tried the same thing. It was recommended to make my C:\ as the active partition. For whatever reason, my computer would not boot after doing that as the BOOTMGR was missing. After doing a system repair, I am back up and running. I still want to wipe that old drive. I found a regedit that ads the "take ownership" command to the context menus. I was able to delete everything manually except for the Windows folder. I really just want to format so I can move things onto a clean drive. I guess you are unable to format what Windows still sees as a system drive. Or would it be because I moved my page file to that drive? How?