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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Grant Bennet-Alder

Level 10

139,649 points

Posted on Feb 22, 2021 12:32 PM

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

you did the latter.

You erased the locked Volume that holds the unchangeable portions of MacOS, NOT your files.

Select the device by its immutable hardwarer device-name and choose erase again.

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3 replies

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Grant Bennet-Alder

Level 10

139,649 points

Feb 22, 2021 12:32 PM in response to uboboss

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

you did the latter.

You erased the locked Volume that holds the unchangeable portions of MacOS, NOT your files.

Select the device by its immutable hardwarer device-name and choose erase again.

Feb 23, 2021 8:46 AM in response to uboboss

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

uboboss Author

Level 1

8 points

Feb 22, 2021 10:49 PM in response to Grant Bennet-Alder

thanks for the reply.. that's what I supposed..

how can I erase the other one?

I'm not able to enter in recovery mode, I press command + r but nothing happen..

Andy

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initialize hard disk mac pro