Added a WD 120 gig for extra storage and the Seagate 160 was a bit noisy. One thing I had to do was swich which bay the drives were located- This was because the default boot drive is the the one in the upper bay unless you like holding down the option key. Also, all connectors were already installed ready for that second drive. >Has anyone experience in adding SATA drives to their G5? > >Can you please share supplier, installation and usage experiences?