Hi guys, I have a MBP 13" mid 2010 with a 720Gb HDD and with a 480Gb SSD installed instead of the DVD bay working perfectly. I have also a MBP 13" 2012 non-retina. I moved my HDD and SSD from the 2010 mbp to the 2012 one, and after doing the change, my HDD freezes every certain time for around 20 seconds and it starts working again. I thought something was wrong in the HDD bus so I swapped the locations of the SSD and HDD and I get the same behavior. I reinstalled El Capitan and no changes. The mbp 2012 with its original hdd and optical drive works properly too. Any idea? Thanks?!!