Struck read/write errors on a Thunderbolt 1-attached SuperDuper! backup drive. I’ve has suspicions about the T/bolt cable for a while. Fortunately, for this Seagate GoFlex interface I also have a pair of USB 3 interfaces & a FireWire 800 adaptor, so I’m trying the backup clone again, this time on USB 3. Thus far, no errors reported.
I have another T/bolt cable somewhere so I’ll use a process of elimination to work out if it’s the other cable or the interface that’ Going wonky.