On Nov 14, 2006, at 11:52 AM, revDAVE wrote: > What is the largest size ATA100 drive that is safe to put into an > older G4 > desktop (g4 450 - not yosemite)? 120 GB. > - I believe it has something to do with the internal controller > card and how > large of the drive it will allow... Its a problem with the BootROM (though I thought it was the controller too). I plugged a separate controller card into my G4 and hook larger drives up to it -seems to work fine, can even boot from it. > Also - I imagine with the proper external case ( that says it can > format > 300-400 gigabytes) - that the same drive could be properly > formatted and > run on this older computer - is this true? Yes. For more info, see "Macintosh: Using 128 GB or Larger ATA Hard Drives" <http://docs.info.apple.com/article.html?artnum=86178> -Mike