I'm working with a late-2015 27" iMac with a 4.0 processor and 16 G of RAM. The user bought this machine with the 256 flash option. The only drive in this machine is the 256 G flash drive. I know these machines are outfitted to also carry a platter drive, either on its own or as a "Fusion Drive". I am familiar with how these machines are put together in general, so I don't need a take-apart guide. I need some very specific information about this specific configuration. This machine has a 256 flash drive down behind the logic board. That would mean the space where the hard drives goes is unoccupied. I am aware that they don't have different logic boards for different configurations. That means the logic board in this machine is ready to receive a second drive. So, here is my question: Is everything else there for me to put a drive in place? What I'm really asking is: is the drive connector cable there? I'm assuming I can buy the housing rails. But, that connector cable, is it there? Or do I need to order that as well? I am pretty sure that is Part Number: 923-00664. But I don't want to order it if it's already there. Moreover, I may not even proceed if I discover that it's not already there. Because if it's not already there, that means a complete disassembly and that's not going to be fun. Any insights, especially from folks who have done this before, are welcome.