Now that I've read a lot about the wonderful benefits of SSDs (speed, response, etc.), I seriously think about getting one for my Mac Pro 1,1. The prices here in Germany seem to be around 2.50 EUR / GB at this moment. Regardless of the size of the SSD. Of course, I do not want to invest money unnecessarily for unused space. Therefor, I consider a small 40GB SSD as a nice tradeoff. My configuration currently looks like this: Hard Drive 1: SAMSUNG HD753LJ 750GB hard drive and 2: WDC WD2500JS-41SGB0 250GB (The original disk). Right now, everything is stored on the Samsung hard drive, while on the WDC I keep a few backups. The plan is: Dsik 1: 40 GB SSD in question (see title) Hard Drive 2: Samsung HD753LJ 750GB and Hard Drive 3: WDC WD2500JS-41SGB0 250GB (The original disk). In addition, I would slim down my system so that only OS X, applications, everyday documents, and developer stuff (Xcode, Mac ports, etc) is put on the SSD. Movies, music, downloads and photos will be put on the Samsung and the WDC remains as it is. Does that make sense? How much space should be kept free on the SSD?