If they're sandforce drives you should just use Secure erase. You don't need an OS to use secure erase. If i remember correct yours are the OCZ vertex 2. Correct?
Go
here and get the OCZ Toolbox for your drives then follow the instructions in this thread. You have to burn the iso to a boot disk.
http://www.ocztechnology.com/files/s..._7_11_2011.pdf