>> 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