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A recent Mac with an Intel processor can boot from a USB 2.0 Hard drive. Earlier Macs could only boot from a Firewire Hard drive. When you turn on the Mac hold down the Option (alt) key. This will cause the Mac to scan for all available bootable drives. Select the one you want to boot from and it will start up from that drive.

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Q: Can a Mac boot from a usb 2.0 Hard drive?
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