Disk Utility will automatically choose the format for you.

Click on the Erase option from the four options available in the main window.

NOTE that formatting your drive will erase the contents, so make sure you back it up first!

Once Disk Utility is open you’ll see the list of available drives on the left.

Either head to Applications > Utilities, or tap Command + Space and start typing Disk Utility.

Windows can read HFS+ drives but can’t write to them. There’s also an option of MacOS Extended (Case-sensitive, Journaled, Encrypted) if you are likely to have file names that require capital letters. You can encrypt your drive and require a password to access it. There’s also the option of MacOS Extended (Journaled, Encrypted) which is a good choice if you are likely to be carrying your laptop or external drive around and don’t want anyone to access the contents of the drive should you accidentally lose it. If your Mac isn’t updated to High Sierra it will offer MacOS Extended as the default. MacOS Extended (Journaled) (also known as HFS+) – APFS replaced MacOS Extended as the default file system on the Mac when Apple launched High Sierra in 2017. For now we’d advise against formatting in APFS because it won’t be readable by Macs that aren’t running High Sierra, but this may not matter to you. And it currently only works on SSDs or Flash storage. But it won’t be readable or usable by a Mac that isn’t running High Sierra, and Windows or Linux machines won’t be able to read or write either. You can choose an encrypted version and a case-sensitive version. There are a number of things that are good about it – such as it being more efficient and more reliable. We’ll describe them below, and you’ll be able to choose the one that suits you.ĪPFS (Apple File System) – This is the new file system that Apple bought to Macs with High Sierra and it will be the default if you are using that version of macOS. There are a few file formats that you can use but the one that’s right for your circumstances depends very much on what you are going to be using the drive for. Making a bootable macOS install drive (covered here) and if you areĭoing a clean install of macOS. Other reasons you might want to use Disk Utility include

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