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I've tried using 4 different pen drives with my Windows 8 virtual machine in VirtualBox and for some reason it just won't show.

What am I doing wrong?

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Do you run VirtualBox on Linux? If so, are you running the OS Edition? – adc Jan 30 '12 at 15:19
Running it on Windows7! – Federer Jan 30 '12 at 15:27

First of all, you have to realize that Windows 8 is not yet released. This is the most likely cause.

However it is possible that you did not install Virtual Machine Guest Additions? That might fix it...

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It is certainly installed. – Federer Jan 30 '12 at 15:45
Can you confirm that USB does work with other OS'es (other than Windows 8)? If not, it may be that your configuration is wrong somehow - perhaps you did not install the USB driver properly on the original installation of VirtualBox. – Joshua Jan 30 '12 at 17:45

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