New
#31
Not always. Some BIOS software will auto detect for a primary boot partition, and change your boot order without any help from you at all. Thus, it could indeed get confused with two seperate primary boot partitions. I've actually seen this happen on many occasions.
If the 1.5 is new, and had problems right out of the gate, I would just RMA it, and be done with it. I'm sorry, but I did not realize it was a brand new drive, or I would have suggested this WAY earlier.