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From: J Burns <burns@nospam.com>
Newsgroups: comp.sys.mac.system
Subject: Re: How do I check my SSD for damaged files?
Date: Tue, 12 Nov 2024 11:00:38 -0500
Organization: A noiseless patient Spider
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On 11/11/24 4:30 PM, Your Name wrote:
> On 2024-11-11 17:50:39 +0000, J Burns said:
>>
>> I used WIFI to migrate from an M1 Mac to an M4, both running OS 15.1. 
>> Thunderbird still worked on the M1, but when I tried to launch it on 
>> the M4, the system said it was damaged and should be discarded.
> 
> That sounds like the usual MacOS Gatekeeper anti-malware system message. 
> It usually means nothing (unless you're downloading dodgey pirate apps) 
> and can be bypassed, although gets more difficult with every new version 
> of MacOS.
> 
> Gatekeeper would check on the first run, find the certificate is no 
> longer current or the app doesn't match the original install version, 
> and so complains that the app might be dangerous, when in reality it 
> isn't dangerous and isn't corrupt. Possibly the developer's certificate 
> was fine when the app was first run on the old computer, but for some 
> reason had been changed (e.g. renewed under a different name) by the 
> time it was first run on the new computer. Some apps alter themselves 
> after install for things like preference settings, auto-updates done via 
> the internal check, etc.

Thank you! I wish Apple had made it clear.
> 
> 

>>
>> Do I need a third-party utility?
> 
> Since the app almost certainly was not corrupt, I wouldn't waste your time.
> 
> 

I did waste 65 seconds running First Aid. I think the warning that it 
could take hours was hogwash, as was the recommendation that running it 
from Recovery would help. Sequoia isn't compatible with any Mac before 
2018, and I guess the biggest internal drive is 1 TB SSD. How could it 
take hours?