Re: What does "Reinstall macOS" do, exactly?

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:
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<snip>
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How many folk realise that
reinstalling the macOS will NOT eradicate any previously installed malware?

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Anyone who has a clue re what they are doing around computers.
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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?
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If you replace the water feature in your back garden, did you expect all the weeds to disappear as well?
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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!)