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SSD replace HDD in bought used compter

I just bought a used MacBook Pro late 2011 (delivered in a week). It has a HDD that I want to replace with a SSD. It comes with only the OS on the HDD, nothing else. Do I have to copy the HDD to the SSD? Or can I just install the SSD and boot up the computer? If so, how do I do this?


New to MacBook Pro coming from a Toshiba windows laptop, so be kind please.

Posted on Sep 15, 2021 10:06 AM

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Question marked as Top-ranking reply

Posted on Sep 15, 2021 6:17 PM

It depends what OS has previously been installed on the laptop. You should be able to boot into Internet Recovery Mode using Command + Option + R to access the online macOS installer. In theory it should launch the macOS 10.13 High Sierra installer, but sometimes it will only launch the installer for the OS which originally shipped with the laptop from the factory. If macOS 10.12.6+ has never been installed on this laptop, then I'm not sure what macOS will be accessed (if any).


You can also create a bootable macOS 10.13 High Sierra USB installer using the instructions in this Apple article:

https://support.apple.com/en-us/HT201372


You will need to first use Disk Utility from within the macOS installer to erase the new SSD as GUID partition and MacOS Extended (Journaled). After erasing the whole physical SSD, quit Disk Utility and select the "Reinstall macOS" option.


Here is an Apple article with some useful special startup key combinations:

https://support.apple.com/en-us/HT201255


Make sure to always have frequent and regular backups.


Edit: The instructions to "erase" the whole physical SSD is for macOS 10.11 to 10.13. "Erasing" the drive is equivalent to partitioning & formatting a drive in Windows or Linux. If you are installing macOS 10.6 to 10.10, then you will need to partition & format the whole physical drive using the instructions in this article:

https://www.owcdigital.com/assets/support/support-formatting-and-migration/Mac_Formatting_6-10.pdf

1 reply
Question marked as Top-ranking reply

Sep 15, 2021 6:17 PM in response to mike939

It depends what OS has previously been installed on the laptop. You should be able to boot into Internet Recovery Mode using Command + Option + R to access the online macOS installer. In theory it should launch the macOS 10.13 High Sierra installer, but sometimes it will only launch the installer for the OS which originally shipped with the laptop from the factory. If macOS 10.12.6+ has never been installed on this laptop, then I'm not sure what macOS will be accessed (if any).


You can also create a bootable macOS 10.13 High Sierra USB installer using the instructions in this Apple article:

https://support.apple.com/en-us/HT201372


You will need to first use Disk Utility from within the macOS installer to erase the new SSD as GUID partition and MacOS Extended (Journaled). After erasing the whole physical SSD, quit Disk Utility and select the "Reinstall macOS" option.


Here is an Apple article with some useful special startup key combinations:

https://support.apple.com/en-us/HT201255


Make sure to always have frequent and regular backups.


Edit: The instructions to "erase" the whole physical SSD is for macOS 10.11 to 10.13. "Erasing" the drive is equivalent to partitioning & formatting a drive in Windows or Linux. If you are installing macOS 10.6 to 10.10, then you will need to partition & format the whole physical drive using the instructions in this article:

https://www.owcdigital.com/assets/support/support-formatting-and-migration/Mac_Formatting_6-10.pdf

SSD replace HDD in bought used compter

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