I have a HP Pavilion dv7 laptop with dual hard drive bays. I upgraded to a 500GB hard drive and made it my primary drive and placed my old original hard drive in the secondary bay. The the secondary hard drive does not show up in my computer. To check it I placed it back in the primary bay but when I turn on the computer I get the message "no bootable drive found" or something like that. So have I corrupted the old drive which was working before the upgrade? Do I need to reformat it and how would I do so? Thanks in advance.