On 11/02/05, whshaw <whshaw at erols.com> wrote: > > I have an eMac using os 10.4.3 and a WD Dual-option external USB 2.0 > Hard Drive I use for backup. > I've been reading "Take Control of Mac OS X Backups" and it says that > you can boot from an external FireWire drive but not from a USB 2.0 hard > drive. If I use a cable that connects to a firewire port on my computer > to my hd will this work? That's true, there are some exceptions, but Apple doesn't support booting from USB devices. See <http://docs.info.apple.com/article.html?artnum=106474> for details. BTW, if you're not making bootable backups (using CarbonCopyCloner, SuperDuper!, or some other backup utility), there's no way to ensure that you can restore your system to whatever state it was when you made the backup.