Specifications

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VMware GSX Server Virtual Machine Guide
Disconnecting USB Devices from a Virtual Machine
Before unplugging a USB device or using the Removable Devices submenu to
disconnect it from a virtual machine, be sure it is in a safe state.
You should follow the procedures the device manufacturer specifies for unplugging
the device from a physical computer. This is true whether you are physically
unplugging it, moving it from host to virtual machine, moving it between virtual
machines or moving it from virtual machine to host.
This is particularly important with data storage devices (a Zip drive, for example). If you
move a data storage device too soon after saving a file and the operating system has
not actually written the data to the disk, you can lose data.
Human Interface Devices
USB human interface devices, such as the keyboard and mouse, are not handled
through the virtual machine’s USB controller. Instead, they appear in the virtual
machine as a standard PS/2 keyboard and mouse, even though they are plugged into
USB ports on the host.