On 08/21/07, <thekirkline1941 at verizon.net> wrote: > > I purchased my G4 in May of 02. I would like to install a large HD, 500gb if >possible. How do I determine if my model can handle this size HD? I purchased >it from MacMall. I suppose it could very well have been manufactured before >2002. According to <http://docs.info.apple.com/article.html?artnum=86178#bootrom>, your machine can't support more than 128 GB HDs. You need a PCI card with 48-bit LBA support. Check out your machine's specs at <http://support.apple.com/specs/powermac/>.