You can also run into issues if you move the drive to a different controller, or the same controller with different drivers. We saw that show up at work a few years ago. Someone upgraded the Intel storage driver on several workstations, then they wouldn’t see the drives that had been setup on the workstations with the old drivers, and vice versa. As a bonus, neither set of drives worked right when we popped them into a USB dock, but worked ok via eSATA on the workstations where they worked internally. We found the USB issue when we were trying to migrate the data before upgrading all the Intel drivers to the latest version, which also fixed an issue of drives “disappearing”.