The BIOS of the VMware Workstation does not support to boot from a USB drive or stick which is connected to a virtual machine.
But there is a workaround:-) Use the Plop Boot Manager. Download the latest ZIP File and extract the plpbt.iso file. This contains a CD image which starts plop boot manager. Connect the iso file as a virtual CDROM to your virtual machine.
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the default setting in Windows Vista, 7 or 8 is to assign a drive letter when you plugin a removable device. But sometimes you want to prevent Windows from doing that, for example security reasons.
You can control this behaviour with the mountvol command. The following command line disable the automatical assignment.
to enable the auto assignment again execute