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OS X is my host OS.

I have windows xp and Ubuntu 10.10 on guest OS. They both work great. When I eject USB flash drive from host OS, it appears in windows guest OS but it does not appear in Ubuntu Guest OS.

I never run both guest OS at the same time. It's always either or.

I am running, VM VirtualBox 4.1.10 and installed latest guest additions and also installed VM virtualbox extension pack.

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If it's a USB 2.0 device you will need to enable it in each Virtualbox image.
Make sure that your USB settings for the Ubuntu guest OS is similar to the following:

enter image description here

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thats exactly how enabled, I don't have a screen shot handy to post. Still guest ubuntu does not show the usb flash drive. however windows guest OS shows. so I don't it did set up correctly in the host OS VM – Raama Mar 23 '12 at 13:33
tachyons - I added the user group as described in this post but still it does not work. I don't know whats the problem is – Raama Mar 23 '12 at 14:34

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