Just picked up an Imac 20" G5 2.1ghz 512mb 250gb. Will be upgrading to 2.5gb Ram this week from OWC. The Imac came with 2 discs OSX Tiger for Imac. I also have a DVD Install disc for OSX Tiger. My question is are these two install discs the same? IE. I would like to do a reformat and clean install of OSX like I do on my WinXP box. Does the discs that come with the Imac have some uneeded applications like those OEM computers that come with AOL, etc. Also, I would like to create two partitions on my hard disk 1-OSX/APPLICATIONS and 2-STORAGE how would I do that on an Mac? Thanks!