If the drive is listed as NTFS-formatted, you're going to need to format it to something else if you want full compatibility with Mac OS X. If the drive's format comes up as MS-DOS (FAT) or, less likely, ExFAT, you may be able to simply leave the drive as-is and not bother reformatting it.

Once the bootable USB of macOS ready, you can connect it to your Mac device and begin installing macOS from it.By subscribing, you are agreeing to Engadget's Terms and Privacy Policy. In our test, the tool took close to 45 minutes, though. The bootable USB should be ready in about 30 minutes. Step 8: When you see the warning dialog box, click the Yes button to begin preparing your macOS bootable USB. Select the macOS DMG file and then click Open.

Under Disk image to restore section, click the small button with drive icon on it (refer to the picture below) to browse to macOS DMG file.

Step 7: Clicking the Yes button will open Restore Disk Image to Drive dialog box. Step 6: Once the format is done, right-click on the USB drive again, and then click Restore with disc image option.Ĭlick Yes button when you see the following warning dialog box. When you see the warning message again, click Yes button to continue and format the drive for Mac. We are naming it as Seirra install drive. Step 5: Clicking Yes button will open Format Drive for Mac dialog box where you need to type a name for the drive. So we need to partition the USB drive with GPT partition first before transferring the DMG file to the USB drive. This is because, if you have been using a USB flash drive with Windows operating system, the USB drive is likely using MBR partition type. Right-click on the USB drive and then click Format Disk for Mac option.Ĭlick Yes button when you see the warning dialog box. Step 4: Once TransMac is launched, in the left pane of the program, you will see the connected USB drive that you want to use to prepare macOS bootable USB. When you see the TransMac Trial dialog box, Click Run button.Īlternatively, you can navigate to TransMac entry in Start menu, right-click on it, and then click Run as administrator option. To do so, type TransMac in Start menu search box, right-click on TransMac entry in search results, and then click Run as administrator option. Step 3: Run TransMac software as administrator. Once the TransMac is downloaded, double-click on the setup file to run the installer and get it installed on your PC. That said, if you often need to prepare macOS bootable USB from Windows, you should go ahead and buy the software. TransMac is a paid software but the 15-day trial copy can be used to prepare bootable USB without any issues. Step 2: Visit this page of TransMac and download the latest version of TransMac software on your PC.

Os x flash drive