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How to Fix an Undetectable USB Flash Drive?
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In device manager,you need to enable 'both' devices.and make internal sound device the primary. the drawback is the internal speakers will also be on. if the USB doesn't mute with the phones,you would have to un plug them with the phones.
They make cases for them. They have slots where you can put individual drives , and you can store them and lock them in your desk when you are gone.
If you find them then uninstall each flagged device. Restart your computer, wait for the system to reassign the drivers, then try again.