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Well, my excellent idea has proven successful, but maybe in an unexpected way. I created a 2nd DrivePool for my non-critical \movie\ data using my suspect 6TB USB HDD. Everything seemed to be working fine as I used Teracopy to move 6TB of \movie\ files to the new DrivePool using the verify command to ensure all files were 100% correct upon transfer. Everything worked fine for a day or two. Thinking I was good to go, I was about to add some more older HDDs to that 2nd DrivePool when, for whatever reason, that 2nd DrivePool went offline and I could not access it (only the suspect 6TB USB HDD on the pool at that time). Fortunately for me, I only had that one suspect 6TB HDD on the 2nd DrivePool at that time, so troubleshooting was fast and easy. Turns out, that suspect 6TB HDD has a tendency to shut itself down, go offline, and then throw the DrivePool into an error state. I was able to unplug the 6TB, plug it back in, and then both the drive and the 2nd DrivePool came back to life. This happened a couple more times yesterday, with that 6TB USB HDD going offline seemingly random, requiring me to unplug it and then plug it back in, so I decided it was just not worth the trouble trying to salvage use out of that 6TB HDD anymore. I am currently in the process of using Teracopy with verify to move all the \movies\ file off that 2nd DrivePool with only the 6TB USB HDD back to my original DrivePool. Turns out that creating a 2nd DrivePool using only that suspect 6TB USB HDD was a good idea because I quickly was able to determine there is indeed something wrong with it (despite all the diagnostic programs that scan it and report it is working fine). The only program that correctly determined the HDD was failing was Seagate Seatools using the long generic test (it passed the short tests). Unfortunately, the HDD is out of warranty so I will have to just eat the loss and move on. But, I would like to shout out to Stablebit Drivepool because, even though that 6TB HDD is failing, my data seems to be recoverable. I am currently about 50% complete on the file transfer off that suspect HDD and all files are intact. I can guarantee you that if that same suspect HDD had gone bad in my MS Windows 10 Storage Spaces setup, using data packets spread all over the pool, it would have most assuredly crashed the entire Storage Space and all my data would have been lost. How do I know that? Because I used Storage Spaces for years and after my 3rd catastrophic loss of data due to a HDD failure, I moved over to Storage Spaces. Despite having 2 and even 3 HDD failure protection on Storage Spaces, I lost entire pools of data when only 1 drive out 20 drives went bad. I guess I can attest to the fact that when a HDD goes bad in DrivePool, I have been able to recover my data off that failing HDD. For my few folder/files that require duplication, I have 2x or 3x duplication set and with DrivePool I don't worry that any 1 drive will crash my entire pool. Thanks to everyone for their responses and helping me work through this issue.