I have reformatted my hard drive a few times (and/or re-installed OS X. I dont know much about computers so I dont really know what I did) and I just got done securely erasing the data on my HD and reinstalling OS X. I followed these steps that I found online: Insert the install CD and reboot the system. Hold down the C key directly after you hear the startup sound. Once the installer appears, select "Open Disk Utilities" from the Installer menu. In the left device menu select the drive you wish to securely erase. Click the "Erase" tab in the window that loads on the right. Choose the HFS+ format from the volume format drop menu options. Click the "Options" button and select the "Zero All Data" checkbox. Click OK and then Erase. All was well until I got down to "choose the HFS+ format from the volume format drop menu options." There was no HFS+ that i was aware of. However, there were several other volume options. I do not recall all of them( I should of wrote them down.) but they were like...Macintosh HD extended, Macintosh HD extended (journaled) There were about 3 of them...Im worried that each time I tried to erase my HD and reinstall OS X I created a "volume" or something I should not of. I hope this makes sense. I guess the point of all this is that im worried that these "volumes" or whatever still have data from before I deleted all files from my HD. Can someone make sense to all this and relieve me from the worry that I dont have several copies of all my previous data stored? I just have that feeling when I sell this macbook someone can go to one of those volumes and retrieve my info. And what is a volume anyway? Well...as you can tell I dont know what im talking about. Thanks for the help.