Downloading and installing a new OS gives you the opportunity to do some major house cleaning if you so desire. If you feel like you'd like a fresh start with macOS Mojave, you can always opt to do a clean install: Just follow the steps below, even if you've already installed macOS Mojave. Make sure you understand the before you get started. • • • • Note: If you are reading this article on the Mac you want to perform the clean install with, switch to another device or print this page before continuing so you can read along as you go. Step 1: Back up your Mac This process will erase whichever OS you're currently using from your hard drive entirely. That means any files, programs, or documents you have will be deleted.

To save your files, put them on an external hard drive or a cloud-based program like Dropbox, OneDrive, or iCloud. If you don't save these important files off your computer, you will lose them. Step 2: Create a bootable drive of macOS Mojave Before you erase your current operating system, download macOS Mojave from the Mac App Store. You'll need a copy of macOS Mojave to perform a clean install later on. If you don't create a bootable drive for macOS Mojave, you may have to install an older Mac operating system first and then upgrade to macOS Mojave afterward.

2 Methods to Format USB Drive on Mac. External drives are factory pre-formatted but despite this, there are times when you will have to re-format the drive. For instance in case you need to change the file format of a drive, just create a bootable installer or clean a USB of viruses you should know how to format. There are actually different methods to format USB drive on Mac OS. 4 Format a Disk to HFS Without a Mac Mac OS X Mountain Lion gives users several ways to access the Terminal and three common options for formatting a hard drive.

• Step 3: Erase your hard drive • Connect your Mac to the internet via Wi-Fi or Ethernet • Click on the Apple icon. • Select Restart from the drop-down menu. • Hold down Command-R when you hear the startup chime (or the screen turns black on newer Macs) and keep holding the keys until your computer reboots. • Click on Disk Utility in the OS X Utilities selector. • Click Continue.

Delay send in outlook for mac. • Select your Startup Disk. • Click on the Erase tab at the top of the window. • Enter a name for the file to be destroyed (Like macOS Mojave or something). • If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list.

If your Mac is using APFS, select APFS from the format list. • If Scheme is available, select GUID Partition Map. • Click Erase. Step 4: Reinstall a new copy of macOS Mojave.

• Click on Reinstall a new copy of macOS. • Click Continue. • Click Continue again when the installer window appears. • Agree to the software terms and conditions. • Select your hard drive.

• Click Install. • Complete the installation process. Any questions about performing a clean install? Let us know below in the comments. Updated September 2018: Updated for macOS Mojave's public release.