I was replacing my dying HD with SSD but as this is now another question/issue and it's a laptop for the 2 that tracked my adventures, I've created a new thread rather than spam that PC build thread with laptop things. The SSD replacement was successful. In the picture below, HDD0 is the slot the HD was in that I replaced with SSD. This is fine.
HDD1 I'm confused about. The connectors, rather than being horizontal, is vertical (I expected it to look like HDD0. And I presume it's covered up with something, although I didn't try very hard to pull it (it seemed firm). Does that mean I need those short ribbon like cables to connect it to my hard drive? I'm confused why it isn't the same as HDD0. It also didn't come with a caddy/holder so I'll need to dig one up anyway (HDD0 was already in a caddy)
Spoiler for huge:
Spoiler: show
It's unlikely I'll use it. But if I can then I can fit a 2TB drive for more media goodness. Otherwise, it's 6 years old, so excuse the dust.