Once the bootable USB of Sierra OS is ready, you can connect it to your Mac device and begin installing macOS Sierra.In this article, I want to show you How to create a Bootable USB for Mac OS Sierra with TransMac. The bootable USB may take more than 30 minutes. A warning dialog box appears click Yes to begin preparing your macOS Sierra bootable USB. Click on (…) and locate the Sierra DMG file.ġ6. A new dialog box will be opened, “Restore Disk Image to Drive.”ġ4. Click the Yes button when you see the following warning dialog box, “This disk may contain mounted PC volumes. Once the formatting is completed, again right-click on the USB drive, and then click Restore with disc image.ġ2. You will get a prompt “Format Complete.” Click OK.ġ1. Wait till the “finish” of formatting the USB disk.ġ0. Again, it will prompt with the warning to overwrite. So it needs to partition the USB drive with GPT partition first before transferring the DMG file to the USB drive.Ĩ. This warning message comes because you have been using a USB flash drive with Windows operating system the USB drive is likely using MBR partition type. A Warning will pop-up, “This disk may contain mounted PC volumes. Right-click on the USB drive and then click Format Disk for Mac.Ħ. Once TransMac is launched, you can see the connected drives from the left pane of the software. Click the “Run” button to continue with the trial.ĥ. If you are Windows 10 user, then type TransMac in the Start menu search box, right-click on TransMac from the search results, and then click the Run as administrator option.Ĥ. Note: Copy all the data to a safe place because, during the process, it will be erased.ģ.
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