Apple has already renamed its desktop operating system OS X to macOS, and also announced the upcoming macOS Sierra operating system. Registered developers can download and use the macOS Sierra, the latest version of macOS.

The macOS Sierra bootable USB drive can be prepared on a Mac PC without the help of any third-party tools. However, if you want to prepare the bootable USB disk from Windows PC, then it is also possible with the help of TransMac.

Requirements to Create macOS Sierra Bootable USB Drive from Windows PC?

  1. Windows PC running Win 10 / Vista / 7 / 8.
  2. A USB disk with at least 16 GB of storage
  3. macOS Sierra DMG (image) file
  4. TransMac Software (Download link)

Note: TransMac is paid software, but it comes with a trial period of 15-days, without any restriction.

How to Create macOS Sierra Bootable USB Drive from Windows PC?

1. Connect your USB / Pen drive with Windows PC.

Note: Copy all the data to a safe place, because during the process it will be erased.

2. Install TransMac software on your PC.

3. Run TransMac software as administrator.

If you are Windows 10 user, then type TransMac in Start menu search box, right-click on TransMac from the search results, and then click Run as administrator option.

transmac-search4. Click “Run” button to continue with the trial.

transmac-trial5. Once TransMac is launched, from the left pane of the software, you can see the connected drives. Right-click on the USB drive and then click Format Disk for Mac.


6. A Warning will pop-up, “This disk may contain mounted PC volumes. Formatting will overwrite them. Are you sure you want to continue?”.

Click Yes.


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. So it needs to partition the USB drive with GPT partition first before transferring the DMG file to the USB drive.

7. Rename the Volume Name and click OK.


8. Again it will prompt with the warning to overwrite. Click Yes.

9. Wait till the “finish” of formatting the USB disk.

10. You will get a prompt “Format Complete”. Click OK.

11. Once the formatting is completed, again right-click on the USB drive, and then click Restore with disc image.

restore-with-disc-image12. Click Yes button when you see the following warning dialog box, “This disk may contain mounted PC volumes. Restoring will overwrite them. Are you sure you want to continue?”.

warning13. A new dialog box will be opened, “Restore Disk Image to Drive”.


14. Click on (…) and locate the Sierra DMG file.

15. Click OK.

16. A warning dialog box appears, click Yes to begin preparing your macOS Sierra bootable USB.

The bootable USB may take more than 30 minutes. Once the bootable USB of Sierra OS is ready, you can connect it to your Mac device and begin installing macOS Sierra.

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