How To Reinstall Mac Os From Usb

Plug the bootable installer into a compatible mac.

How to reinstall mac os from usb. Or maybe you re looking to install the operating system from scratch. Click on the download button if you re on high sierra or earlier. Once your bootable usb installation media is ready remove it and insert it into your mac power it on holding down the option key and select the usb you just created to reinstall mac os x. If a wireless network is available you can choose it from the wi fi menu which is also available in macos recovery.

Downloading mac os dmg file might save you. Whatever your reason installing macos from a usb drive isn t hard. Macos recovery makes it easy to reinstall the mac operating system even if you need to erase your startup disk first. If your mac is really old as in so old it s running mac os x snow leopard or older it will not have a recovery partition the only way to reinstall the os is to use the discs that shipped with.

You just need a few things. An 8gb usb drive. If you have a macos dmg you can create bootable usb disk from a windows pc use a software like transmac for this purpose. If you re having issues trying to create a bootable media you can get a usb flash drive that comes with mac osx ready to install.

Back up your mac. Use startup manager or startup disk preferences to select the bootable installer as the startup disk then start up from it. Choose a friendly name which you ll use later and make sure to choose mac os extended journaled for the format. With your information wipe complete you are now ready to reinstall macos.

Finally click erase and you re done with this step. The installation process will begin. All you need is a connection to the internet. Open an app called time machine.

After creating the bootable installer follow these steps to use it. Clean installing or restoring a mac offline with usb pen drive. As said earlier you could use the macos usb installer to do a clean install or restore it upon a boot failure. To download the macos installer open the app store and search for your version of macos.

Maybe you ve got multiple macs and a limited amount of bandwidth and don t want to download the entire operating system for every system. If you don t do this step you will not be able to recover files nor restore anything if something goes wrong. Before you begin to reinstall mac os from usb you should back up your mac. To back up your mac.