" My post will surely be followed by several
“fdisk /mbr screwed my disk” comments.
My questions in response are “what else did you do before trying
fdisk /mbr?” (i.e., what else was screwed up or what else did you
screw up) and “did you read the warnings about using fdisk /mbr?”
(i.e., for safety, only have one drive connected when you run fdisk /mbr).
To pirate a slogan, “Fdisk doesn’t kill drives, people kill drives”.