First thing - I can't see any illegalities in the partition table in the output of fdisk, but Gparted is showing "unallocated" which is what happens when there is. So I'm somewhat puzzled at the moment.
About RAID and the package dmraid. Simply uninstalling dmraid would not remove RAID metadata which is the other possible problem, even though you are sure the hard drive has not been used for RAID. You say that dmraid is not installed - I assume you mean in your 10.10 installation which would not be surprising since dmraid is not installed by default. And what is or is not installed in 10.10 would be irrelevant to your problem anyway. However, it is present in the live CD session and we can use it to see if there is indeed RAID metadata on your hard drive for whatever reason.
Boot up the live CD and go to the live desktop, open a terminal and run this command:
Do you get the message "no raid disks" or "INFO: RAID device discovered:"? If the latter, please post the entire message - there will be another line - and we'll take it from there.
sudo dmraid --raid_devices -v