Ah, OK. So I get some PUA0: errors ticking up every so often, most of which are right after the system has had some "hiccup" of non- interactivity for several minutes. Some initial research indicates that the PU device is the UDA controller, which is what I believe the CQD-220 masquerades as (more or less). Right now, after three hours of sitting basically idle, it's logged 26 errors. So I'll have to check that out. It could be something as simple as balky SCSI termination, since I do have 4 devices in the chain and the terminator is a Jaz drive using internal termination. I'll play with it some. Hopefully it's not the hard drive going bad, since my supply of SCSI drives is essentially dry. It's a bit worrisome that it's the PU device going bad rather than the DU device, but I'm not 100% sure how VMS logs the errors, so it could be what I suspect.