-bash-2.05b$ sudo kextunload -v 6 IOUSBFamily.kext
kextunload: request to add kernel extension /System/Library/Extensions/IOUSBFamily.kext
kextunload: adding repository /System/Library/Extensions
kextunload: added repository /System/Library/Extensions
kextunload: request to clear relationships while disabled; pending
kextunload: scanning directory /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDC.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCACMControl.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCACMData.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCDMM.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCECMControl.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCECMData.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCEEM.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBCDCWCM.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBEHCI.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBHub.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBMergeNub.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBOHCI.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBOpticalMouse.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBUHCI.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/AppleUSBVideoSupport.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/IOUSBCompositeDriver.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/IOUSBHIDDriver.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/IOUSBHIDDriverSafeBoot.kext
kextunload: found valid extension IOUSBFamily.kext/Contents/PlugIns/IOUSBUserClient.kext
kextunload: added kernel extension /System/Library/Extensions/IOUSBFamily.kext (and plugins)
kextunload: calculating version relationships
kextunload: unload kext IOUSBFamily.kext failed