Simon Smith, eVestigator, http://www.simonsmithevestigator.com.au, Cyber Security expert here. As vendors close in to get market share they close in on software and hardware binding equally. This is something to look out for. Adding more fuel to the fire, Apple Macbook Air’s I happen to know for a fact (and I’m sure most of their product line) rely on the WiFi chip for authentication of a device ID to allow OS upgrades. If your WiFi busts, don’t think you can pull out the old WiFi dongle. You are stuck on that version of Mac forever. The hardware and software combination that Apple like to use is becoming extremely dangerous. One chip failure can render an entire computer useless. From my own personal experience, as this machine was out of warranty, Apple would only replace at a cost the entire Motherboard for a $3 chip. So beware, there is another technicality to add to the puzzle. Lucky this time, it was fixable by software, next time – maybe not so lucky.