Thank you again for the prompt replies. Although nervous to throw that switch, a new configuration was indeed the fix. The array is running and accepting gigabytes of data as I write this. Once my replacement 8TB drive arrives I'll install it as parity.
The thing that drew me to Unraid in the first place is the ability to ad drives adhoc. Years ago my backup strategy was to buy the largest drive available/affordable, put it in a dock or enclosure, backup everything to it, then shut it off until the next backup. As the years went by larger drives kept coming out and I began to collect 1TB, then 2TB, 3TB, 4TB, etc all with low hours of spin. I've been searching for a JBOD type NAS solution to consolidate all these drives and data as well as make it accessible and I think I have now found it with Unraid.
marksnas-diagnostics-20220727-2042.zipmarksnas_Main.pdf
I had to save the Main page of the GUI as a PDF as I couldn't fit the whole thing in a screen grab.
I do not have any parity drives assigned yet. Maybe that is why I cannot remove disk 4, the 40gb drive? Without going into a long-winded diatribe, I bought 3 Seagate 8TB drives for this NAS and one ended up being DOA. I shipped it back for warranty and have the 2 working ones in the array and plan on using the third as the parity drive once I get the replacement. In the meantime I have been dumping data into the array though I have not yet filled one 8TB drive yet. As I free up the 3 and 4TB drives I have kicking around, I plan on adding them to the array as they become free. I have a Wasabi cloud account and plan on using it for off-site BU of the array.
What initially attracted me to Unraid is the ability to add drives adhoc without the need for them all to be the same size, speed, etc since I have acquired a lot of drives over the years that I have used for off-line storage so they all mostly have low hours.