You have 37 tracks in your cubase session, but only 2 audio files, is that right? While I don’t know what your problem is or why only Cubase is showing the i/o overload, I can tell you it is unusual for Cubase to have a disk i/o overload on a session like that and I think that’s probably why you haven’t received many responses to help you solve your problem. It would not be unusual however, for an 8 year old hard drive to have problems.