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From: "David B." <BoaterDave@hotmail.co.uk>
Newsgroups: alt.computer.workshop,comp.sys.mac.system
Subject: Re: What does "Reinstall macOS" do, exactly?
Date: Sat, 12 Jul 2025 12:36:02 +0100
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In-Reply-To: <mdefufFqn68U1@mid.individual.net>

On 12/07/2025 08:07, David B. wrote:
> On 18/08/2024 23:14, T i m wrote:
>> On 18/08/2024 22:42, David Brooks wrote:
>>
>> <snip>
>>
>>> How many folk realise that
>>> reinstalling the macOS will NOT eradicate any previously installed 
>>> malware?
>>
>> Anyone who has a clue re what they are doing around computers.
>>
>> See, if you understood what an OS was and what isn't part of the OS 
>> (like the personal info you state is still present), what part of it 
>> don't you understand?
>>
>> If you replace the water feature in your back garden, did you expect 
>> all the weeds to disappear as well?
>>
>> Cheers, T i m
> 
> I've just done this:-
> 
> davidbrooks@DavidBs-iMac ~ % diskutil resetFusion

[snipped important facts! for brevity!)

Resetting Fusion is supposed to *erase all data* from both the spinning 
disk and the internal SSD.

However, having reinstalled macOS Ventura (from the Apple servers) I now 
have all my software programmes (applications) available, just as they 
were before.

Perhaps "Tim" will be able to explain why that should be.

(David actually knows!)