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<blockquote data-quote="djames42" data-source="post: 401025" data-attributes="member: 13241">Plug in your external drive to your Macbook. Ensure that it's HFS-formatted (this is done in Disk Utility; new drives are generally pre-formatted in FAT32 and can be read and written to from OS X, but this filesystem cannot be used to boot from). What you'll see in Disk Utility is something called &quot;Macintosh Journaled&quot; or some such thing.Insert your MacOS DVD and begin the install process. Your computer will reboot. Ensure you select the external volume as the destination. Wait a half-hour. Reboot. Done.PowerPC Macs are limited to Firewire (as far as booting from). Intel Macs (such as the Macbook) can boot from either Firewire or USB.As for the why--there are several reasons for wanting to do this. You can set up different environments with different boot partitions. External drives can be faster (I boot my Mac Mini from a 7200 RPM Firewire drive because it is faster than the 5400 RPM IDE 80gb drive that shipped with my old G4 mini).</blockquote>

[QUOTE="djames42, post: 401025, member: 13241"] Plug in your external drive to your Macbook. Ensure that it's HFS-formatted (this is done in Disk Utility; new drives are generally pre-formatted in FAT32 and can be read and written to from OS X, but this filesystem cannot be used to boot from). What you'll see in Disk Utility is something called "Macintosh Journaled" or some such thing. Insert your MacOS DVD and begin the install process. Your computer will reboot. Ensure you select the external volume as the destination. Wait a half-hour. Reboot. Done. PowerPC Macs are limited to Firewire (as far as booting from). Intel Macs (such as the Macbook) can boot from either Firewire or USB. As for the why--there are several reasons for wanting to do this. You can set up different environments with different boot partitions. External drives can be faster (I boot my Mac Mini from a 7200 RPM Firewire drive because it is faster than the 5400 RPM IDE 80gb drive that shipped with my old G4 mini). [/QUOTE]

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