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User profile for user: uboboss
uboboss Author
User level: Level 1
8 points

initialize hard disk mac pro

Hi everyone, before sending to apple my macbook pro for a battery replacement, I want to delete all files in it. ( I already have time machine backup on external hard disk )

So I open the laptop in recovery mode, utility disk, and clicked " initialize" macHD.

The question is: I saw 2 different macHD in recovery mode , one smaller ( 20gb) and one bigger (100gb). I initialized the smaller one, and then the screen turned all black showing a "?" .

I want to know if I deleted all files in it or only the OS ( but all data are still in the HD).

Any opinion about this? is there a way to know if mac is empty or not?!

thanks in advance


Andy


Posted on Feb 22, 2021 12:16 PM

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
133,363 points

Posted on Feb 23, 2021 8:46 AM

this article has the approved procedure, provided you do NOT have a firmware password installed


How to reinstall macOS - Apple Support


if you Mac has a T2 chip, there is more to the process:


About Startup Security Utility - Apple Support



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initialize hard disk mac pro

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