I am using my Macbook Air since last 2 years and it runs smoothly till day but an only thing is that the hard drive of this macbook is not just enough for me to have all of my data on it. So i an looking forward to use an external drive of 40 Gb to store some of the data. The files which i am gonna move are photos and movies which i have captured using my digicam. Now i am thinking to install an operating system on this external drive so that i can modify those files directly. There is only one usb port on my macbook so it won't be flexible to use this external drive as usb stick forever. By the way what is the space required to install Mac OS X.
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