I have a MBP on the way with an 128 gb SSD. I have a large iTunes library that I am interested in keeping on my notebook so I was interested in placing an HDD in the optibay. My question is, will the 160gb HDD from my 2007 MBP function well (I was considering the OWC data doubler) as a second HDD? Also, are there any significant cons to having a second hard drive (other than obvious lack of optical drive)? Any input would be greatly appreciated!