The lengthy

process of upgrading to Windows 10 from the Insider Preview edition is now done. Along the way I have learned a bit about Advanced Host Controller Interfaces, Serial Advanced Technology Attachments, and how these affect Solid State Drives. And above all the virtues of the button marked "Reset to Default Values" in the BIOS settings. Once I found that, it all became easy. Now the RAID drives are rebuilding from the backups and all seems calm. Soon the covers can go back on.