"secondary GPT table is corrupt or invalid" issue again

[Pete French]

>  8. rsync -avH /src/ /dst/
>     but i have to admit thet rsync was much slower than tar ... it was
>     about 8-9 hours for 750G of data to copy

Use /usr/ports/sysutils/cpdup instead - faster, and designed to make
exact copiues which rsync doesn't to the bets of my knoedge. It's
what I always use form copying running installations around, and works
flawlessly. If you have both drives mounted then it's definitely
the way to go.

-pete.