I had to completely remove the I/O board out of the case after I disconnected it from the power supply. Then I could unscrew the screws holding the hard drive in place. I dont know how anyone can get the hard drive out without doing this. I have a 2012 mac mini so there is this whole step missing in these instructions. I dont have any pictures yet. If you look at the instructions for Installing Mac Mini Late 2012 Dual Hard Drive Kit on step 16 & 17, you can see how to completely remove the I/O board, then you can look inside the case and see the hard drive screws that need to be removed so you can get the hard drive out

I had to completely remove the I/O board out or the case after I disconnected it from the power supply. Then I could unscrew the screws holding the hard drive in place. I dont know how anyone can get the hard drive out without doing this. I have a 2012 mac mini so there is this whole step missing in these instructions. I dont have any pictures yet.