Yes, it does. And if the slightest error occurs during the process, you wind up 
with a wiped hard drive and a Mac that doesn’t work. All your data is gone!
Also, any anomalies that have accumulated during the time the old OS was in 
service get carried over to the new one.
Cheers,

Anne

> On 14 Oct 2015, at 23:18, Devin Prater <[email protected]> wrote:
> 
> But doesn't installing a new version of an OS basically wipe the old one 
> clean, then install the new one, just leaving the settings and all?

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