Hi, I recently inherited a 2007 MBP 15-inch. I erased the hard drive, reinstalled SL, updated to 10.6.8, and installed Lion. It is all set up now, and surfing the web I learned that it is recommended to use the security options when erasing the HD. I didn't even see them. I assume that it didn't use any security measures. Does this mean I will have less space on my HD than if I had used the security options? And if so, I have another question. I don't want to go through the huge SL/update/download Lion/install Lion/transfer-files rigamarole again. Would it be possible to erase the hard drive again, this time using the security measures, then use Time Machine from Snow Leopard to restore the MBP and my files to the way it is right now? Or would this just end up restoring the old data I don't want (from the previous user) back to my computer? Thanks for any help, sorry this is so long.