Mac OS X 10.4.x (Tiger) ships, by default, on a DVD. This poses a problem for Macs shipped without a DVD drive, those with non-functional DVD drives, or those which have had their drives manually ...
Like Lion (OS X 10.7) before it, Mountain Lion (OS X 10.8) doesn’t ship on a disc—it’s available only as an installer app downloadable from the Mac App Store ...
Currently the drives are in spanned RAID mode, from what I can gather from the Command+R > Disk Utility read out. It says that it's got a 1.5TB hard disk, when there are 3x 500GB drives physically ...