Both the internal and external drive are about a month old, bought at the same time. HGST Deskstar 4TB 7200 RPM SATA III 6Gbps, 64MB Cache. External drive is in a FW800 enclosure.
So what could possibly have gone wrong here?
I guess I could pull the machine apart again and swap the two drives. I'm not sure what else to try.
It seems very unlikely to me that one of these drives is faulty when the other is not, especially as it doesn't seem to exhibit any other failures (nothing in logs, I/O seems fast, etc.)
But even if it's a motherboard problem that just happened to manifest when I swapped drives, it is still an I/O problem so why can't I prove that with numbers?
