would it be a good idea to (if i can) crack open my 750 gb WD My Passport HDD and put it in the optical bay of my Macbook Pro instead of 500gb hdd that i have now? the 500gb hdd i have now is 7200rpm and the WD is 5400rpm. from what i gather, if you have a ssd and a hdd in your laptop you would put your OS and apps on the sdd and everything else on the hdd. would i notice a speed difference if im listening to music (or watching movies) off the 5400rpm rather than a 7200rpm? Since my computer has to read it off the hdd and play it with itunes (or quicktime) on the ssd, is that going to be a problem (same thing with documents like .pages or .txt, will i have a problem if the document itself it on the hdd but the app is on the sdd)? What i was thinking of doing is partitioning 128gb of space on my optical bay drive for CCCloner since the ssd im getting is only that big, and the rest would be for everything else so i just wanted to get as much space as i can. it would cool if i could stop plugging in my external drive for backups. Is there anything else that should go on the SSD instead of the HDD besides OS and apps?