Hi everyone, a few months ago, I bought a 2.5" 500GB 7200RPM SATA Seagate HDD for my MacBook. I could definitely notice a speed boost in boot times and loading over the stock 120GB Seagate drive that was in my MacBook. Last week, I noticed the new drive was taking longer to boot. I thought it may have been because the drive was filling up. However, midway through the week, my computer wouldn't boot. It would just sit on the grey screen with the Apple logo. I put in my OS X install disk, booted from there, and went to disk utility. I tried to verify the disk, but the verification failed. I tried to repair the disk, and that failed too. I bought an external enclosure for the drive, put my old drive back in the MacBook, booted up and the 500GB drive mounted fine, but OS X told me I needed to back up the drive and then format it. I've backed everything up now. My question is, which is broken here? The drive, or OS X? I'm asking because my drive is still under warranty. Should I send it back for a replacement, or if I format it and reinstall everything should it work ok? If it's an OS X issue, than I would feel fine keeping the drive, however I'm leery of that because this really did just come out of the blue. What do you think?