I have a Dell Optiplex 980 with a Raid 1 consisting of two 500GB drives. On two occasions now, my system has frozen but after powering off and turning it back on, it has rebooted successfully (taking a fair amount of time). However, the Raid user interface reports "Sata_Array-0000 volume0: verifying and repairing N.%." Presumably one of the drives has an issue (it's over 4 years old). Is the disk that is failing the one on Port 0 or Port 1 and since the two disks are one on top of each other, how do I know which is on which port? Is the one on top usually Port 0?