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Update or reformat my MacBook pro hard drive from external drive

This is a bit of a long story about messing up updating.

I tried to update from High Sierra to Monterey but I ran out of disc space.

While I waited for a new external hard drive I tried to restore Sierra (what it originally came with) on the internal hard drive.

Now the hard drive is full of failed update data.

I can now start up only from the external drive.

Disc utility has not worked on the internal hard drive yet but I am not very familiar with it.

If anyone knows how I might proceed I would appreciate your help.

MacBook Pro 15″, 10.12

Posted on Mar 7, 2022 3:09 AM

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Question marked as Top-ranking reply

Posted on Mar 7, 2022 3:15 AM

Below will WIPE ALL DATA and there is no recovery - period


To perform this action will require booting from a Bootable Installer


This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of Monterey would have to be done on a computer that Qualifies to run Monterey .


Once that is done read on for preparing the Destination computer  >> Only works on Intel Based Apple Computers.


Extra Special Notation regarding the Touch ID equipped Apple Computer.


About Startup Security Utility and Must Enable from Recovery Mode the ability to boot from External Drive Before Attempting 


1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.


2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive. 


3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives. 


4 - Choose the Upper Most Drive ( not the volumes indented and list below ).


5 - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as APFS with the GUID Partition Map. This applies to macOS 10.14 Mojave and above. 


5A - Formatting for macOS 10.13 High Sierra and below requires HFS Journaled with the GUID Partition Map


6 - Once that is done >> backup out of Disk Utilities and choose install macOS. 


7 - Follow the prompts and it may automatically reboot several time. 


8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.

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4 replies
Question marked as Top-ranking reply

Mar 7, 2022 3:15 AM in response to sfella87

Below will WIPE ALL DATA and there is no recovery - period


To perform this action will require booting from a Bootable Installer


This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of Monterey would have to be done on a computer that Qualifies to run Monterey .


Once that is done read on for preparing the Destination computer  >> Only works on Intel Based Apple Computers.


Extra Special Notation regarding the Touch ID equipped Apple Computer.


About Startup Security Utility and Must Enable from Recovery Mode the ability to boot from External Drive Before Attempting 


1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.


2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive. 


3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives. 


4 - Choose the Upper Most Drive ( not the volumes indented and list below ).


5 - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as APFS with the GUID Partition Map. This applies to macOS 10.14 Mojave and above. 


5A - Formatting for macOS 10.13 High Sierra and below requires HFS Journaled with the GUID Partition Map


6 - Once that is done >> backup out of Disk Utilities and choose install macOS. 


7 - Follow the prompts and it may automatically reboot several time. 


8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.

Mar 7, 2022 4:00 AM in response to sfella87

Welcome and yes do keep us posted on the progress - time permitting.


March 7, 2022 Version # 3


The below points should be consider before attempting the upgrade.


Point # 1 - Does the >>  Computer Qualify for the Monterey upgrade 


Point # 1A - There are reports appearing on the ASC Forums regarding failed installation of Monterey on older Qualifying Apple Computers. In most cases this is related to having a NON Apple Original internal drive ?  


The EFI Boot ROM included in Monterey is verifying for Original Apple Drive and if not found , may Balk or fail to upgrade to Monterey. 


Reports indicate the EFI BOOT ROM is Required to Flash the Computer and is a  requirement for a Successful Monterey Installation.


Point # 1B - Caution - jumping over all the newer versions and directly to Big Sur  / Monterey on Qualifying computers is Technically possible - there are those who have attempted and were successful. Then there are those who attempted and had less than good results.


If this is a Production or Mission Critical Set-up - a more prudent and measure approach is suggested. 


The above is from observations on the Apple Support Community Forums and IMHO


Point # 2- >> How to upgrade to macOS Monterey


Point # 3 - Empty Space Requirements  >> If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44GB of available storage. 


Point # 4 - Empty Space afterwards - it is suggested to keep at least 15% of the Drive Total Capacity as Empty Space for good operations of the computer and for additional updates to Monterey to download, expand and install.


Point # 5 - The upgrade will require a quick, stable and reliable Internet Connection - preferred method is via Ethernet Connection. 


Point # 6 - If using Wifi - move computer as close to the Access Point / Router and disconnect all other devices connected to Wifi. Want the maximum bandwidth for the computer being upgraded to Monterey


Point # 7 -Commercial VPNs should only be used if Mandated by Corporate Head Office for working remotely. Otherwise - ones Privacy and Security touted by the VPN is suspect. 


Point # 8 - If downloading Monterey from behind a VPN it may increase Packet Looses and an incomplete or corrupted Installer.


Point # 9 - AntiVirus Software should be removed as per Developers Instructions. They are unneeded, cause havoc and interfere with the normal operation of the OS including the download and installation of Monterey


The Built in Security  is all that is required. 


There are no known Windows-like Viruses in the wild that self replicate and affect macOS because of the underling UNIX  Foundation and Permission Limitation. 


Point # 10 - Disk Cleaners, Optimizers and UnInstaller are not needed. They will often times attempt to Modify, Alter, Remove or Delete elements of the Operating System requiring a Re-Installation.


Point # 11 - Do you have a Rescue Plan In-Place. This comprises having 3 Backups using 2 methods and 1 Off Site incase of Theft, Loss or Natural Disasters. A Time Machine Backup  is very useful and can be used to Revert to Previous Working macOS


Point # 12 - For addition purposes - two Tested Bootable Clones each to separate external drives. This is insurance incase the upgrades goes sideways. At least one Tested Clone and / or Time Machine Backup should be Off - Site


Point # 13 - Are the installed Applications / Extensions compatible with Monterey. Check with the Developer for compatible Apps / extensions. Do they offer updates or upgrades. Same goes for Third Party Drivers for Printer, Scanners etc.


Point # 14 - If upgrading from Mojave and earlier versions of macOS - Remember that Monterey does not support anything 32 bit. These include Applications, Extensions and Drivers for any devices. There is no workaround.


Point # 15 - To check for 32 bit Applications - a good application to use is Go64 - safe to use.

Mar 7, 2022 3:22 AM in response to PRP_53

Thanks very much for this. I had reconciled to losing the data on the Internal Hard Drive as most of my stuff is on iCloud Drive I should get through with most of my stuff intact.

I will start the process you suggest, obviously it will not be done straight away but thanks for your help and I will let you know if it solved my question as and when I get to the other side.

Mar 10, 2022 11:20 PM in response to PRP_53

I have now managed to partition my internal hard drive and install Monterey. I couldn’t follow your instructions as I could not download a Monterey installer. Everything I found wanted to update things rather than download an installer. I need to check what I have done against yr instructions later to make sure the installation is correct. Thanks for all your help so far. I am making progress.

Update or reformat my MacBook pro hard drive from external drive

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