I'm looking in my friend's hp Pavilion gaming laptop. Before, he only knew there was the first HDD which was the boot drive that had 250 gigs. I went into the back of the laptop to see if I could install another HDD. To my surprise, there was already an SSD back there. It was being held by this bracket and not actually connected to the motherboard. The sticker on the m.2 SSD read 256 gb. I connected it and turned it back on. I went to disk management to allocate it. Nothing was there. Any idea as to why and how I can fix it?