Which is one of the things pointing at the 24s themselves. I think we can safely rule out the cables, because it's making a connection with the external drive, just not liking what it sees. I have another used Thermaltake which I'll swap in this week. The other curious thing is the original external drive, which I thought had permanently crashed after a year or two of use. I couldn't get to work with assorted configs earlier this year, but I got it up and running after trying again this week, only to have it fail again after a couple of days. If the drive had actually crashed or been corrupted, wouldn't it not have connected at all?