[G4] Maximum Size of Hard Drives

[Joe P. ALLEY]

I have a Power Mac PC G4 with a 400MHz Processor,
Memory is 448 MB SDRAM and I am running MacOS X
10.4.3.

I believe that I have seen somewhere, I cannot locate
it now, that there is a maximum size of the hard
drives. Currently I have 1 - 20 GB drive and 1 - 40 GB
drive internally. 

I backup to an external hard drive with 120 GB
capacity. 

Could I mount 2 - 120 GB drives to replace the two ATA
drives internally?

Joe P. Alley