Yes, that's the beauty of 2.5" FW drives.
I boot from one all the time. The Mac powers the drive. Start the Mac, hold the Option key, and select the FW drive at the appropriate time.
Or if the Mac is on and booted and the FW drive is connected, Restart, and hold the Option key.
Of course, you have to have an appropriate OS installed on the external drive.








I am that Masked Man.
All you can do, is all you can do.
There’s trouble — it's time to play the sound of my people.
Your boos mean nothing to me, I've seen what you cheer for.
Insisting on your rights without acknowledging your responsibilities isn’t freedom, it’s adolescence.
I've been to the edge of the map, and there be monsters.
We are a government of laws, not men.
Everybody counts or nobody counts.
When a good man is hurt,
all who would be called good
must suffer with him.
You and I have memories longer than the road that stretches out ahead.
There is no safety for honest men except
by believing all possible evil of evil men.
We don’t do focus groups. They just ensure that you don’t offend anyone, and produce bland inoffensive products. —Sir Jonathan Ive
An armed society is a polite society.
And hope is a lousy defense.
You make me pull, I'll put you down.
I *love* SIGs. It's Glocks I hate.