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{{dablinks|date=September 2013}}
'''Virtual-CDROM switching-utilities''' are computer [[software application]]s used to properly enable USB-connected devices, usually by disabling virtualized optical (CD-ROM) drives; the latter are sometimes [[USB_mass_storage_device_class#Device_access | presented to the host PC]] by various non-CD-like devices.<ref>[http://www.pharscape.org/usb_modeswitch.html USB_modeswitch Virtual CD-ROM switching utility]</ref> The reason the USB-connected device enables a virtual-optical-drive in the first place is usually as a means of auto-installing [[device driver]] software. However, the particular auto-installation mechanism used by the device can sometimes interfere with actual device operation, if the device firmware (or device driver software) does not properly support the exact [[operating system | OS]] version installed on the host-PC. USB-connected printers and USB-connected modems are typical examples of products that sometimes utilize virtual-optical-drives for easy driver-installation; see also [[U3 | usb flash memory sticks]] which utilize virtual-optical-drives for other purposes, which can need virtual-CDROM disabling-utilities.
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