I highly recommend this option, except make certain it's Firewire and not USB (your Mac will not boot from USB). An external Firewire HD would greatly outperform your internal ATA/66 bus. Actually, make that two external HD's, one for Leopard and one of at least the same size or larger for Time Machine. The Time Machine drive can be either FW or USB. - Tony On 14-Jan-08, at 11:12 PM, Richard Klein wrote: >> 2. Install Leopard on an external Firewire 400 or USB 2.0 drive. >> I think this would suffer in performance vs. an internal drive, >> since this machine has ATA/66.