The Optiplex 760 comes with a slimline optical drive that looks like this:
My plan is to have this working as well as 2 hard drives. The Optiplex 760 only comes with 2 SATA ports, one of which is occupied by this drive. However, I discovered that there is an internal USB connector on the motherboard of this model, seen as point 11 below:
I bought a slimline SATA to USB adapter, and along with another USB adapter I had sitting around from a project long-abandoned, I hooked them up and connected them to the motherboard:
Fired up the machine and...it didn't work. I re-seated the plug and it booted but then I didn't have a picture on my monitor when I got into Windows. I thought it might still be loose, so I re-seated both ends again, and voila, booted up fine and the optical drive is now recognized as a removable CD drive. Cool!