I'm preparing my old black macbook for sale (sigh....) to help offset the cost of my shiny new macbook pro. I did a 7-pass erase of the volume "Macintosh HD", reinstalled everything from the install disks the computer came with, and then installed Snow Leopard. probably should have called it a day, but..... Because I'm paranoid, I was on the disk utility gathering the proper information to post a question here about whether erasing "Macintosh HD" is sufficient if it is the only volume, or whether I also need to erase "149.1 Hitatchi...." Inadvertently I pressed erase (with the Hitachi highlighted) , and although I stopped it as soon as I could, I now have "Untitled" where "Macintosh HD" was and I"m not sure what other consequences. How can I rename the untitled volume to Macintosh HD again and is there anything else I should do to repair whatever it is that I did? I assume I'll need to start over with installing the operating systems.