My iMac (G5 1.8GHz 1.25Gb OSX 10.4) is swimming (drowning ?) in 800 Gb of storage capacity as follows: - internal 250 Gb, - external La Cie Big Disk 300 Gb (USB 2.0, FW 400 & 800), - external La Cie Extreme 250 Gb (USB 2.0, FW 400 & 800), - external 80 Gb (USB 2.0, FW 400) only for backup of photos. So far, the three external HDs are connected to the iMac via a FW 400 hub (and the iMac does not have FW 800, anyway). My use of all this capacity is (as could be expected) for the following tasks: photo (storage, edition), video (acquisition, edition, storage), music (storage), office, etc..., doubled with my needs for backup of all of it. It works all fine so far, but I want to be sure I make the best use of it all - How can I test the individual performances of each unit ? - What is the best choice between USB 2.0 and FW400 foe external HDs (despite the obvious loyalty to Apple) ? - Do FW hubs / USB hubs limit the possibilities, compared to individual connections to the iMac and limitations of the motherboard ? - Any difference bewteen FW devices chain-linked or connected to a FW hub ? - From the above, best choice for iPhoto storage, iTunes storage, video storage, video scratch, other apps scratch ? I'll try to keep the internal only for software and system (and memory pages) but does that make sense compared with the exchange rates with the external devices ? Oh well, in summary, a little refresher on FW/USB HD settings Thanks if you can help me here, and I hope this thread is of interest to other people Arnaud.