Hi,

I have a MacBook Air 13 inch, Mid 2011 with Mac OS 10.7.5 El Capitan 10.11.6 on 
it.

I would like to wipe MacBook Air’s drive and re-establish El Capitan on it. 
(Why I need to do this is a longer story)

I have a 4TB USB powered by the USB port it doesn’t have a power supply. 

I was thinking I could use it as an external boot drive while I deal with the 
MacBook Air’s drive.

If it is possible to do the above could someone please point me to some 
instructions for getting this done.

Thank you,

Brian Scott

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