I have an open source program named WinSlacker. It writes to the slack space of a file and reads in the data from the slack space. To write to the slack space you select a file and the app calculates the space available and clusters/sectors and then writes the data. To read from the slack space you select a file and the app reads the data that is in the slack space.
For Vista and Windows 7 you cannot write a sector to the primary partition (such as c:) unless you load a custom driver. I have such a custom driver, but it is not signed and permission must be granted to load it. I would like to avoid the entire issue by simply writing to non-system drives (possibly an NTFS flash drive or a secondary hard drive).
Even with that said, the app does not work with Windows 7. It will not write to sectors outside of the system drives. I may have made a mistake as I query the OS version and use different techniques for XP and Vista.
I do not have time to fix this myself so I need for someone to take the time and fix it. I think it will be fairly easy.
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XP. Vista, Windows 7 There is an alternate download option. You can use the link at [url removed, login to view]