I had a 1Tb data disk that after the last restart showed up in BIOS as a 33mb disk.
After searching i came across this nifty little windows application
“We’ve came up with a freeware tool that handles LBA48 mode setting as well as HPA and DCO features. It does everything automatically: it extracts the factory capacity; then it restores the factory LBA48, HPA and DCO settings.”
After running Direct Download it restored my disk to its former glory.
I do not know which of the above listed settings was incorrect but its all good now.