If the USB drive appears non-functional per the above troubleshooting, please contact SanDisk support for further assistance with warranty. If your USB thumb drive, USB external disk or flash storage contains a usable operating system or a macOS installer, you can select it at boot time using macOS’ built-in feature called Startup Manager, which can be invoked via a simple keystroke. If the USB flash drive is not detected on other computers or if other USB devices are working properly on this Mac then most likely the USB drive is not functional. How to start up your Mac from an external USB storage device. ![]() If the USB flash drive is not listed under USB hub please verify other USB devices work properly and if possible test the USB flash drive using a different computer. This will open the mount point for all drives connected to the Mac computer. You can verify is the drive is mounted by Selecting "Go > Go to folder" from the file menu and typing /Volumes/ (Note: This is case sensitive). ![]() If you see Flash Drive listed under the USB hub the USB flash drive is detected properly. If the Finder preferences are set to mount external drives to the desktop we will need to determine if the USB flash drive is detected by the computer Ensure the check box next to External disks is checked ![]() Click Finder in the upper left corner of the screen and select PreferencesĢ. These Mac models have Thunderbolt 4 (USB-C) ports: MacBook Pro (14-inch, 2021) MacBook Pro (16-inch, 2021) You can connect external displays and other devices that connect using a Thunderbolt 4 cable, Thunderbolt 3 cable, or USB-C cable. With the Flash Drive connected to the USB port of your computer:ġ. First we need to check your Finder preferences and ensure external disks are set to mount to your desktop.
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