I download a new installer each time but I do not do the clean install route each time. I keep each installer and recreate the USB installer with the newest OS update. When High Sierra is released in the fall, I will do the clean install.

I may do a clean install with 10.12.6 on an external drive and compare performance. But I doubt I will do this with the Mac since we are only two months away from a new OS.

From E.T.'s Keyboard. . .
  "God for you is where you sweep away all the
  mysteries of the world, all the challenges to
  our intelligence. You simply turn your mind off
  and say God did it." --Carl Sagan
E-mail: ancient.ali...@icloud.com

On 7/21/2017 1:37 PM, Matthew Dyer wrote:
Hi,

That’s what I thought.  I will be working on this over the weekend.  I will 
report back if I have any problems.  I was always  under the impression that 
with the mac os installer, you had to redownload it everytime a mac os uopdate 
was released for example, if you had 10.12.5 and then upgraded to the latesed  
then you reformatted and installed  you had to update the system each  time 
because if you used the usb installer, you were using an older installer.  Is 
this still the case?

Thanks again for your help.

Matthew



-----Original Message-----
From: macvisionaries@googlegroups.com [mailto:macvisionaries@googlegroups.com] 
On Behalf Of Simon Fogarty
Sent: Friday, July 21, 2017 4:00 AM
To: macvisionaries@googlegroups.com
Subject: RE: Question regarding mac os installer.

Hi Matthew,

 If you use a USB installer media then you can start up to that USB device and 
then under the utilities choose the disk utilitiy tool and wipe the HD  by 
either formatting or partitioning the drive.

 Then start the installation and do what you need to.



-----Original Message-----
From: macvisionaries@googlegroups.com [mailto:macvisionaries@googlegroups.com] 
On Behalf Of Matthew Dyer
Sent: Wednesday, 19 July 2017 11:57 PM
To: macvisionaries@googlegroups.com
Subject: Question regarding mac os installer.

Morning all.  I got a 1 TB external usb drive whare I backup my mac os.
I am hoping to get  my mac os reinstalled over this weekend as I think this 
wwill clean upp some prob lems I have been having.  Here is the question.  What 
is the difference between the searria installer and the recovery disk.  I will 
want to reformat the drive and repartition it before install.  Can this be done 
with the installer?  I have tried using recovery disk assistant to do this, 
buut when opened it just says recovery disk assistant has no windows.  I will 
probley work on this over the weekend as I will have more time,.  Have another 
question, but will put it in another message as it is having to do with 
superduper.
Thanks.


Matthew



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