During the Time Machine run I was able to unmount both volumes. But I also watched which disk was receiving I/O requests during backup prep (disk 2), ...

Ran a "verify disk," and it passed. So it passed verification but wouldn't pass certification. What does this tell me now? Didn't have a spare eSAT...

Okay, I see where you're going, and thanks for the feedback. It's a currently in a Voyager Q Drive Dock, using an eSATA port (it also has USB 3.0, ...

Thank you for the quick reply. My apologies if the original post wasn't as clear as it should be. It is the Master volume RAID 0 (two disks) I wish to...