>> Really? I thought his old drive was SATA (hence his worries that his >> new drive would need new drivers). > No, the old original drive is PCIe 3.0 x4 AHCI. The new one is PCIe 3.0 > x4 NVMe.
If we can't get the two drives connected to the same system at the same time, I guess I'd use a third (USB-connected) drive as intermediary (and do twice the steps I outlined). Stefan