These are the steps I intend to follow to do a clean install of Sierra on my 
MacBook Air. If anyone sees a problem in these steps would you please let me 
know? For example, is it necessary to first D authorize my computer in iTunes 
to avoid problems

One. I have installed Sierra over the top of my Yosemite OS. 
Two. I have backed up my machine.
Three. I will boot into the recovery mode and, using disk utility, I will erase 
and reformat the "Macintosh HD" partition using Mack OS extended journaled as 
the disk format.
Four. I will quit disk utility, and still in the recovery mode, select 
reinstall OS, And follow the install prompts.
Five. I will reinstall Dropbox and other apps, and reset system settings to my 
The overlay of Sierra on top of Yosemite actually works quite well, and seems 
to be without problems, except that the machine seems to heat up more than it 
used to. Also, I have never done a clean install since I got this air with the 
lion OS and so thought it might be a good idea to do a clean install for once.

Sent from my IPhone

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