Dear All, I have a MBP mid 2010 2.66 with a 320 hitachi harddrive (factory one) It will no longer boot in to OSX 10.9. It will soley launch recovery mode. I tried to use Disk Utility to erase the harddrive however I get the message that the drive cannot be deactivated. When I repair the hitachi it states the drive is fine, But when I try the the same for Macintosh HD it runs in to errors. has anyone ever had the same experience? I think it will come down to replacing the harddrive and restoring my Time Machine backup.