"on an adaptec controller"
You possibly have an issue which could be hardware related - This is not the place to try to sort it out, and at any rate, I am not the person who can do this. Please try to retrace your steps, and see if this problem can be repeated. Then fill a Bug report, providing as much information as possible.. In this way, the developpers will have all information available in one central place without having to search the forum. Thanks.