Vostro 3268, adding a second HDD and case fan question

Hi, I want to add a second 2.5 HDD.  My PC shipped with a SSD and I can see in the user guide it mentions: Internally Accessible — 3.5–inch/2.5–inch drive bays - One 3.5–inch or Two 2.5-inch drive bays.  I really hope it's possible to add a second drive.

I took that to assume I could add either another 2.5 SSD or 2.5 HDD.  Total newbie here but will there be a spare SATA connector on the motherboard and will the new drive just slide into the existing cage on this machine?  Also would I need another connector or do these usually ship with a new drive?

Two final questions.  Do the system fan (case fan) always stay on, on these machines? It doesn't seem to be spinning too fast.   I've also noticed when I shut down, the fan (not always and not sure if its the case fan or CPU fan ) gives a very brief but louder woosh noise.  

Thanks in advance if anyone can help!