However, this time, you should use the following steps to use the Diskpart command-line utility on Windows 10 to create the appropriate GPT partition, and then follow the above instructions. In this case, you may need to redo the entire process again. If the USB flash drive is not working with TransMac, it could still be a partition problem. Create a GPT partition on a USB flash drive
Once you complete the steps, you can insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest macOS version, Sierra, Catalina, Big Sur, Monterey, or higher. dmg file with the macOS installation files. Right-click the USB flash drive and select the Restore with Disk Image option from the left navigation pane.Ĭlick the Yes button to confirm the erase of the USB flash drive data. If this is the case, the chances are it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac.Ĭlick the Yes button to format the drive on the warning message.Ĭonfirm a name for the drive. Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device.
However, if none of your devices (MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, or Mac Mini) are not working when you need them the most, you can use a Windows computer to rescue your Apple device. This is one of the main reasons you should consider making a macOS bootable USB when your device works properly.
If the unexpected happens with an Apple computer, you can use a macOS bootable USB with the installation media to repair it. It’s just a matter of time until your computer refuses to start, which could happen for many reasons, including (and not limited to) file corruption, hardware failure, or buggy update. I did it for snow leopard but I'm certain if you downloaded a ubuntu installer instead of snow leopard it would work just as well.It doesn’t matter whether you use macOS, Windows 10, or Windows 11. The restore process for me took just over 20 minutes. In the destination part drag over your greyed out partitioned USB - the grey bit only.
In the source part drag across the mounted installer. The mounted installer will be indented below the downloaded file (hope that makes sense). The installer will probably appear, close it. You'll want to mount your downloaded iso/.dmg file. You want to partition the indented 'untitled' usb, choose '1 partition' and under options select 'GUID partition table'. The 'untitled' was under the USB name itself, indented. Had an 8gb USB at the ready, erased/formatted everything on it and set it to 'Mac OS Extended (Journaled)'. dmg of the installer I wanted (snow leopard). Oh man, I did this a few days ago - the instructions I found were so confusing at first.