Hello there. I tried searching for my answer first, but I couldn't find satisfying answer to my question. Then again, I'm a giant Stupid when it comes to using search properly, so if this is answered already, I apologize I just sold my Macbook so I could buy the upgraded 13" MBP for my last year in school for design. Before meeting the buyer to trade off, I took my computer with me to the Apple store to get instructions on how to wipe all the data and do a clean install. I told the guy at the Genius Bar I wanted all the data wiped and zeroed out, and asked if he had instructions on how to do so. It was a slow day in the store, so he basically did it for me, putting in the install disk, booting from the menu and choosing "Erase and Install" from the menu. It went through the process of checking the disk and took a while to go through a process before installing disk 1, and then disk 2. The disks came out and it started playing the welcome video and asking the basics`for set up. I didn't want to set it up for the new owner, so the Apple guy shut it off, said good to go, and I handed it over to the new owner. The process took about an hour and a half. Now, normally I am very thorough with these things, but for some reason I was more lax with my screening process, and after reviewing these boards, not once did I see an option for "1 pass, 7 pass or 35 pass erase" option... just the "Erase and Install" option from the disk. I'm sure that was fine enough, since the Apple guy seemed to know what he was doing, but now I'm a little paranoid - could my data still be retreived or is it fine? There wasn't anything too sensitive on there, mostly my itunes library, iphoto library, and huge amount of design work from school... but I just want to make sure. Thanks for any help!