Hello, I have a problem with my macbook late 2008. It has a 160GB HD and I placed another 500GB HD where was placed the superdrive. All my files are in the 500HD and the OS (10.7.5) is in the 160GB HD. The 160GB HD is half full, so it has 80GB free space. The problem is that sometimes it freeze and I get the window that says that it has not enough memory to run applications and that I should erase files from the HD. I only use it for internet and I use maxthon browser, sometimes I have more than 10 windows opened. It allways freeze on maxthon. The problem is not the browser, I'm quite sure. This is a unibody macbook late 2008, core 2 duo, 8GB ram. I am thinking about replacing the main HD with a SSD but first I want to be sure there's nothing wrong with the macbook.