Internally, the BaseSystem.dmg Mac disk image file contains a drive that are using the Apple Partition Map (APM), which is not well supported in a Windows environment. If prompted, you do not need to initialize the flash drive. Insert a 8 GB or larger flash drive into an USB port. When finished, close the 7-Zip File Manager application window. If this Downloads folder exists on a volume that is not NTFS formatted, then read this answer and apply the same to this answer. ‡The destination should be your Downloads folder. In this window, right click on each file or folder in the order given in the table below, then select the corresponding action. This should open a 7-Zip File Manager application window. In this window, right click on the InstallMacOSX.dmg Mac disk image file, then select '7-Zip' > 'Open archive'. From a File Explorer window, start by navigating to your Downloads folder. Use a 7-Zip File Manager application window to extract the OS X Install ESD folder, 3.hfs file and the InstallAssistant.icns file from the InstallMacOSX.dmg Mac disk image file to your Downloads folder. Copy the command sgdisk64.exe from the downloaded GPT fdisk zip file to your Downloads folder. If you wish, the installed downloads can be uninstalled from the Windows Control Panel after use.

Install all downloads except “Yosemite 10.10”, “dd for Windows” and “GPT fdisk”. † If you get the message “InstallMacOSX.dmg can't be download securely”, then select “Keep”, as shown below. These are the defaults, so just confirm the settings.Paragon Partition Manager Community Edition 64bit On the right, in the Erase tab, choose to format the drive as Mac OS Extended (Journaled). To do this, launch Disk Utility and choose the destination drive in the drive list (left column). You can also sign in to your Mac as the administrator to create the bootable drive.įirst, you must partition and erase the drive so that it can be bootable. You can change it back to a standard user when you're finished.

If it isn't, go to Users & Groups in System Preferences and assign Administrator to your user account. Your Mac user account must be an Administrator.A flash drive, external hard disk, SD card, or the like, with at least 8GB of capacity.So you have to quit the installer once it appears in order to keep this file. After you upgrade to Yosemite, this file is deleted. The 5GB OS X Yosemite installer app that downloads into your Applications folder when you first install it via the Mac App Store.Here's how to make one using Apple's built-in boot drive creation tool. But what if you need to partition the hard drive, wiping the recovery partition? You need a bootable OS X Yosemite installer.

How do you erase your Mac hard drive and install OS X Yosemite without a startup disk? Normally the answer would be to boot into recovery mode.

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