Remount Ejected USB without Replugging - OS X

You can use this command line to unload and reload the USB kernel extension.

sudo kextunload /System/Library/Extensions/IOUSBMassStorageClass.kext
sudo kextload /System/Library/Extensions/IOUSBMassStorageClass.kext

Instead of ejecting, you can also use diskutil to unmount and remount later.

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