Quote:
Originally Posted by tuni
How do I start from my main SD clone (LaCie FW) without copying anything?
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The usual ways are to either hold down Option while the Mac restarts with the bootable, backup drive attached, or use the
Startup Disk preference pane of
System Preferences.
When you pick a new startup volume with
System Preferences/
Startup Disk, the selection will be "sticky". This means that until you change the setting, the machine will always boot from that volume if it is available (it will boot from a volume on the internal disk if the specified volume is not attached and available).
Option-while-booting will provide you with a list of the bootable volumes attached to the system. Pick the volume you want to boot and click the boot button. The next (non-Option) reboot will revert to the normal startup disk (the one set in
System Preferences/
Startup Disk).
You might prefer the Option-boot method if you know you are only going to boot into the other volume once. You might prefer the preference pane method if you expect to need to boot into the volume multiple times and do not want to have to remember to hold down Option each time.
If the volume you want does not appear in the lists generated by the Option-boot menu and the preference pane, then the system does not consider the volume to be not bootable (usually a disk/Firewire/USB/connection problem or because the disk has the wrong partitioning scheme for the machine).
If you are unsure of the volume from which a machine is currently booted, you can check it with (Apple Menu) > About This Mac.