I recently upgraded my mid-2010 15" unibody macbook pro by putting in a new HDD and SSD (using an optical bay caddie for the HDD). Also added some ram. Worked really well so looking to do the same thing to an early-2008 (non-unibody) 15" macbook pro. My main concern is compatibility. I basically had a friend tell me what to buy for my 2010 mbp since he had done the same operation. This time I'm flying in the dark. Based on some initial spec research, it seems like the following components should be compatible, but I just want to make sure before I buy. I understand the size limitations, but I'm a bit lost when it comes to PATA vs SATA, SATAII vs SATAIII, etc. etc. HDD: http://www.newegg.ca/Product/Product.aspx?Item=N82E16822145881&cm_re=2.5%22_7200 rpm_9.5mm-_-22-145-881-_-Product SSD: http://www.newegg.ca/Product/Product.aspx?Item=N82E16820147371&cm_re=ssd_120gb-_ -20-147-371-_-Product Bay Caddie: http://www.ebay.com/itm/2nd-HDD-Hard-Disk-Drive-Optical-Bay-Caddy-for-Early-2008 -Macbook-Pro-MB404LL-A-/300660461171?hash=item4600c28e73 RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E16820148201 Also, assuming these upgrades work.. can I run yosemite? Help!