"I can only think that when I typed in volume names above that setting I clicked outside the text box to terminate entry and accidentally lit up that checkbox "
Gee, what tripe I wrote there. Talk about not being on the same page!
I don't mind if you pick me up on stuff like that. As long as you are delicate....
Anyway.... I decided that google result about RAID was tripe too, and didn't change anything. Too much effort, too. Error 4280 appears to be about misreads, or read information not complete... and that had to be marginal burning on CD-RWs. I tried another, fairly new disc, and Bingo.
Comprehensive program, L-UK.