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If you see the same info as the picture shows, congratulations, you can move to step 2. There you should see the partition map type of external drive. 3.ğind Storage on the left menu bar and check the USB drive from the list of volume.Or you can click the Apple icon and select About This Mac > More Info… Hold the Option key and choose Apple menu > System information. Plug in your external thumb drive to your MacBook/MacBook Pro/iMac. Check whether your external drive can be functioned as a startup disk: This step is necessary only when your USB device not using a GUID partition map. Step 1: Check and Format USB Drive to Be Bootable on Mac Step 3: Choose to Start up Mac from Your USB Flash Drive.Step 2: Create Mac Startup Disk on External Drive (macOS or Mac OS X).Step 1: Check and Format USB Drive to Be Bootable on Mac.If you have a thumb drive, CD, DVD or other storage device with Mac operating system installed, you can choose to boot from USB on Mac instead of the built-in startup disk, and if not, please follow the 3 steps in this article to learn how does Mac change boot order to USB drive. There are ways to format a flash drive that runs in a different format and we will show you steps to take to remedy the situation.Certain situations like troubleshooting, updating, formatting, reinstalling will require a Mac to be booted from external drive, and at the same time, it’s a good habit to create a bootable USB for Mac in case of emergent system crash. If you have made the mistake of buying a flash drive they run on a FAT32 file format you don't have to discard it altogether. If your drive is an APFS format or a Mac OS format you can format your drive easily but if it is a FAT32 format this may be a problem.
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Mac devices on the other hand run on either Mac OS Extended or APFS. Most USB flash drives on sale are designed to work with Windows operating systems that run on Fat32. Mac Systems have a different OS to Windows and this is where most of the problems like. You may not know how to format your USB flash drive to make it compatible with your Mac system but we do and will show you how to do it in this article. If your USB flash drive is not recognized by your Apple Mac computer because it has a different format it is kind of difficult to format it.
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