Is it bad to wipe free space on a SSD? in CCleaner Posted June 7, 2010 · Report reply My topic has got locked, but MrT has been in contact with me. This is what I wrote back to him: Well, we stopped the testing after confirming it with 3 SSDs on a Win 7 x64 platform. My writer's assistant has been doing some research on the specific Write File Windows API, and actually has found that it is frowned upon the SSD community. What that API does is write to any space on the hard drive that currently has no files, or files that aren't allocated by windows resources or programs...then completely delete that space. My contact with OCZ in their inspection of the returned drives has found that the firmware has been erased. Without any present firmware on a SSD, it makes it completely invisible to both Bios and Windows. However, the SSD can still be recovered, but by no conventional means.