DISKPART> convert gptĭiskPart successfully converted the selected disk to GPT format. DISKPART> cleanĭiskPart succeeded in cleaning the disk. (Find the disk number) DISKPART> select disk x (from result of List Disk)ĭisk x is now the selected disk. Here are the Diskpart commands used to prep the Flash Drive, just to have them here in case my Link does not work: diskpart I've been trying to post this to confirm that it works for some time, I just hope it helps someone else, because it is a very easy solution. Someone had reported that the method for using DISKPART did not work, but I have done this twice and it works remarkably well, and it's the only method I could find to create a Mac-Bootable Flash. I used TransMac on Windows 7 to restore the image file I had to the Flash Drive, it created a bootable Mac image on my flash drive. Dryden's Link, I was able to use the Diskpart command to clean and prep a GPT partition on a flash drive for an OSX Mavericks install image. I was never able to write a Mac installer image to my Flash Drive and have it bootable, unless I did it on a Mac. 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.I know this question is old but it is still valid. 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. Use the “Restore Disk Image to Drive” dialog box to browse for the DMG file with the installation files (for Mac OS X Yosemite in this case), and click OK to create a bootable USB of the Operating System. Right-click the USB drive you’re intending to use to reinstall Apple’s OS X and click “Restore with Disk Image”. On the left pane, you’ll see all the Windows PC drives listed. You’ll be prompted to “Enter Key” or “Run”, because we’ll be using it once, click “Run”. Right-click the TransMac software icon and “Run as administrator”. Make sure you take off any important documents. Remember that all the data in the USB will be erased. Insert the USB drive that you’ll use to fix your installation of OS X.

Type the create partition primary command and press Enter to complete the task. Type the convert GPT command and press Enter. Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter.

Type the list disk command and press Enter to view a listing of drives connected to your computer. Type the diskpart command and press Enter. While Windows is installed on the OP's Mac, this answer assumes the Windows machine is not a Mac.įrom Windows, open a “Command Prompt with administrative permissions” window.

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