Macs and PCs are pretty much the same, you don't need to throw away your PC knowledge coming into Macs.CommonMan said:Yes, I agree, it's important to differentiate between memory (RAM) and disk space (hard drive, flash, floppy, etc.). I've worked with PCs for quite a while now so I know the difference between these things. Since I just bought this Blue & White Power Mac G3/350 (code name Yosemite) loaded with OSX (and nothing else), I am just now learning about 0SX and Macs in general. I need to install and second larger hard drive in this computer since it only has 6 gigs and I need a lot more. Based on what I've read so far, it looks to be pretty easy.