2nd HD in Dell Precision M4700 w/o replacing optical

I got an M4700 at work loaded up with 2 hard drives. An SSD for my system and a traditional HDD for all my data. We have an unused 256gb SSD that i'd like to use to replace my current 128. However, I cannot find where the 128 is. The HDD is in the regular hard drive location and I cannot find any reference to the location of a second hard drive in this laptop anywhere. The owners manual makes no mention of it. And everything I've found on the interwebs is about replacing the optical with a hard drive.

 

Look for msata or wwan port in service manual. Your ssd is there

 

oooooooohhhh...gotcha. I have seen those referenced. Just had no idea that a hard drive went there. Thanks! Will look into that.