I have my OEM Interior Hard Drive for my imac (160gig). I want to place it for sell on ebay BUT, at the time i shut down my computer and replaced it with the new one. Then i formatted and installed my Os. Wouldn't my old Hard drive have my Os and all my folder, music, pics, etc... on it? The thing is i keep a file where i stored my username and passwords for web sites and stuff on it. Nothing really personal. I guess i could change my password. But if someone buys it, they will have access to all of that? I didn't have it set to log-in with a password. Please let me know because i would like to sell the Seagate 160 gig hard drive asap for some extra cash for the hollidays.