You should extract your important data firstly. Note: A format of USB drive will wipe out all data within it. Format USB drive with containing an operating systemĪ USB drive should be formatted with a GUID partition type, so that it can be used on Mac. Moreover, the USB drive should be left 16 GB or larger to install a complete copy of the operating system.įor avoiding any data loss, you had better backup your Mac data to other external drives.Ĥ. Most Mac computers have the USB 3.0 ports, so, you had better use a USB drive with supporting 3.0, which carries the faster read and write speeds. USB flash drives are available in multiple ways.
They are iMac Pro, Mac mini introduced in 2018, MacBook Air introduced in 2018 or later and MacBook Pro introduced in 2018 or later.īootable optical USB drive with a GUID partition type and an OS X installer or other operating systems. The Apple T2 Security Chip is Apple's second-generation, which delivers new compatibilities to Mac. Intel-based Mac that have Apple T2 Security Chip Let's check what you should do before booting it.ġ. Preparations Before Making Mac Boot from USB Driveīooting Mac from a USB drive is an easy task, but it requires you to get all preparations well. How to Boot Mac from USB Drive Using Startup Manager How to Boot Mac from USB Drive via Startup Disk Close out of the installation screen that pops up, then hunt for Install OS X El Capitan in your Applications folder to verify its there. When booting, you need to hold down the ALT / Option key on the Mac keyboard while powering on the machine to boot from USB. Preparations Before Making Mac Boot from USB Drive Step 1: Download OS X 10.11 Installer Once youve downloaded the El Capitan installer from the Mac App Store, dont install it just yetit will auto-erase the installation app you need if you do.
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