To get around that, we’ll run Windows from an installation DVD or a USB drive. You can’t format the primary drive while it’s running, for the same reason that you can’t repair a car engine while driving. Your C drive (C:) is your primary drive where the operating system (OS) is located. How to format a primary drive (C:) on Windows But it’s a little different if you’re formatting the primary drive, a secondary internal drive, or an external hard drive.
If not, skip do wn to read about the differences between formatting a primary and secondary drive, and make sure you learn about the relevant file systems - NTFS, FAT32, exFAT, and APFS - and understand which one to choose.įormatting a hard drive on Windows is largely the same whether you’re using Windows 10 or 7.
The drive will be formatted HFS+, but installing macOS High Sierra or Mojave will change the format to APFS, assuming you’re installing on an SSD.If you know which drive you want to format and which file system to choose, then go immediately to our instructions for formatting a hard drive in the following section. Disk Utility showing GUID option for drive formatĬlick Erase to wipe all the data that’s currently on the drive and reformat it for your macOS install. If you selected the drive name instead of its description you won’t see the Scheme option. Set the format to Mac OS Extended (Journaled) and the Scheme to GUID Partition Map. Disk Utility’s View option shows devices, not just volumes Select the drive description just above the drive name for the device you want to format. Now you should see your drive device descriptions with the drive name nested underneath. Disk Utility hides the GUID format option by defaultĬlick the View widget in the upper left corner of the Disk Utility window and choose Show All Devices. The app is hiding in the Utilities folder inside the Applications folder. Start by connecting the drive to your Mac. We’ll use an external drive for this example. Unfortunately, Disk Utility in macOS High Sierra doesn’t make that option easy to find. Formatting a drive so you can install and boot macOS requires the GUID partition map.
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