CPU is very hot when using Thunderbolt display and mac attached USB hard drive for TimeMachine

Hello,
i've bought the new MacBook Pro 15" and a Thunderbolt display. Everything works fine for me due to the latest updates, but i experience an issue which i really don't understand. When i connect an usb hard drive for TimeMachine to my display it works like expected (CPU has a temperature of 64°C), but when i connect it to an usb port of the mac while using my display the CPU temperature goes crazy (spikes about 80°C) and it gets very noisy. Has anyone else experienced this behaviour?
May this has something to do with the dual graphics adapter and how the system handles the data stream to thunderbold ports and usb devices? Which graphics card is used for the external display, the internal gpu or the adapter from ati? I've googled a lot but haven't found appropriet answers about these questions.

Hi there ulairi9!
I understand how this would be a frustrating issue! I have an article here that can provide some troubleshooting steps for you, and can hopefully help you resolve the issue. That article specifically addresses the issue you are experiencing, and can be found here:
AirPort Extreme and Time Capsule: External USB drive becomes inaccessible
http://support.apple.com/kb/TS3271
Thanks for using the Apple Support Communities!
Cheers,
Braden

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