Connect the USB device to another computer.Thus, you should go to Finder > Preferences > General and. Connect the USB device to another USB port. Occasionally, your Mac has already recognized the USB flash drive but not shown it on the desktop.When you see the word 'Show' or 'Hide', please click to change it. Go to Finder -> move your cursor to the Locations section in the left panel. Go to Finder -> Preferences -> Sidebar, and make sure the Hard disks option is checked. You should see a device disappear from System Information when you remove the USB device, and it should appear again when you reconnect it. Go to Finder -> Preferences -> General, and make sure the Hard disks option is checked. Wait a few minutes, and click File > Refresh Information. Open System Information and disconnect the USB device from your computer.If you install a new USB device and Mac OS does not detect it, you can complete the following tests to identify the issue: Click About This Mac > More Info > System Report.In the top-left of the screen, click the Apple icon.To open System Information, complete the following: 1) Format a flash drive GUID partition scheme and Mac OS Extended format. You can find the name of the chipset by navigating to, searching for the product ID, and clicking the Technical Specifications tab. Go to Finder -> Preferences -> General, and make sure the Hard disks option is checked. Despite using UEFI, the MacBook s native EFI bootloader does not use the EFI. The USB device is displayed in System Information, under the name of the chipset. Examples of appropriate headings for a USB video adapter include "USB without the driver installed" or "Graphics and Displays". To determine if Mac OS detects your USB device, you need to open System Information on your computer to see if your USB device is listed under the appropriate heading or is listed with an error (for example, "Device has not been configured").
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