Booting from ext hard drive

Then realize that when you say, "I read..." or "I heard..." without providing your source, people may find it hard to believe you, or they may take your suggestions with a rather large grain of salt.

Just a heads-up. Having such problems with organization and memory doesn't benefit anyone.
 
i have also read the macs have been USB bootable since the slot load iMac

Yes, an iMac that can boot natively with OS 9 can do so over USB. However, the boot process is super-slow, as USB 2.0 is not supported in OS 9, and most Macs that boot OS 9 will have USB 1.1 ports.
An eMac USB 2.0 model, for example, has USB 2.0 ports, can't boot natively to OS 9, and also can't boot to OS X over the USB bus, unless the arcane Open Firmware commands are entered, then providing the USB boot.
That would be the only option on most PPC Macs to boot OS X through USB.
 
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