> Oh I think I understand. When throttling is enabled, the likelihood of an HDD error
> occurring increases because it's being sampled over a longer period of time.
That's partly it. But you're ignoring my main point: It doesn't matter whether he was unthrottled or not. If it didn't work in one run but worked in a later run, that just indicates a flaky drive. Who the hell knows if it will work throttled or not. The point is that if he has a CHD that passes audit, but which mysteriously fails sometimes but apparently succeeds other time, then it's likely an issue with his HDD, not with MAME. Is this so hard to understand?