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I'm looking for software that lets me have many virtual USB drives on my Ubuntu installation. I want them to be seen by virtual machines in VirtualBox so I can do backup operations. I need the drives to be presented on USB bus and not as virtual hard disks.

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Have you seen this question/answers? – jofel Mar 21 '13 at 9:31
well his solution is very hard to be understand :S – Nancy Smith Mar 21 '13 at 9:38
Do I understand your question correctly? You want to simulate many usb hard disk to your virtual machines to test backup programs. – jofel Mar 21 '13 at 9:49
@jofel yep , but not hard disk ! flash . Mass storage – Nancy Smith Mar 21 '13 at 13:14

My suggestion: Switch to qemu/qemu-kvm. It can simulate usb mass storage devices to virtual machines. See here for some examples.

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I can't change virtual box . it's used by my company – Nancy Smith Mar 21 '13 at 13:15
can i use them both ? – Nancy Smith Mar 21 '13 at 13:16
I found this but couldn't install it – Nancy Smith Mar 21 '13 at 13:25
You need to install the kernel headers to compile it. – jofel Mar 22 '13 at 9:29

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