Apple initially designed this tamper-resistant system in 2009 to secure the battery in its portables. Now it's the first line of defence in getting past the bits of a Mac you can actually touch with your dirty non-Apple hands.
You can buy special screwdrivers to loosen the Pentalobe screws, and you'd be wise not to try using something that merely looks like it would do the job.
Most other security screwdrivers will quickly strip the miniature heads, stopping over-eager geeks or maybe even Apple ever trying to unlock the device again. It's a case of when the shut hits the fan.
The desktop Macs don't fare much better either. The latest iMacs are literally glued down. Apple has fused the iMac's glass front panel and the LCD together, where they used to be attached with magnets.
To remove the adhesive you need to use a heat gun! Legendary teardown artists iFixit then had to use low-tech guitar plectrums to pry the two pieces apart. Cutting open the display destroys the foam adhesive. Putting things back together requires peeling off and replacing all the original adhesive.
Get the message? Apple doesn't just deter you from opening its products; it will destroy the device if you even try. So that's why the Mac Pro has been on death row for so long. In order to get the latest processors you need to buy an unopenable iMac and not the brazenly accessible Pro.
Steve Jobs once said that the backs of Apple's computers look better than the fronts of its competitors. He could have added that you are more than welcome to look at these backs just so long as you don't touch.
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