Optibay mod with SSD issues... help?

So I finally gave in and did the mod to have 2 hard drives in my MBP. Installation was smooth. Computer booted. No issues.

But now I have issues.

I put the SSD in the standard slot and put my pre-existing HDD in the new optibay slot. My computer recognizes the location and the harddrive. I've formated the drive properly and everything.

My issue is now the performance of the secondary drive (the standard HDD) is becoming very odd. Sometimes I can drag files over to it. Sometimes I cannot. Today I was getting error code -50 when trying to even drag a single file over.

I can read files off it fine and also drag files from the HDD to my SSD. But I'm having extremely odd issues allowing files to be put over to it.

Anyone have any ideas?