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The problem with most USB [[3G]] modems is they have two modes. In one mode they are a USB flash drive and in the other mode they are a modem. Typically they only ship with Windows device drivers, sometimes [[Macintosh|Mac]] device drivers as well. In any case, they seemingly seldom, if ever, ship with Linux device drivers. What normally happens with Windows is the device starts up as a USB flash drive, the [[Computer hardware|hardware]] drivers are installed and then they are responsible for "switching" the device in to modem mode so you can use it. This "switch" is done via some codes, specific to the device, which controlling software can pass as a command to switch from disk to modem mode. The virtual CD-ROM switching utility manages the switch of mode from disk to modem, the latter disconnects any mounted disk containing software we don't care about that won't work anyway and, crucially, creates a modem port/serial device (usually <tt>/dev/ttyUSB0</tt>) for the networkmanager.<ref name="3g_usb_modems ">{{Cite web|url=http://www.drupaler.co.uk/blog/installing-3g-usb-modems-linux/497|title=Installing 3G USB Modems On Linux}}</ref>
The approach of adding Virtual CD-ROM with software drivers on a 3G or storage devices has two problems: it presumably raises the cost of the device, and it may ship outdated software or even virii. Most of the times, up-to-date drivers are anyway built into the operating systems. Virtual CD-ROM on U3-compatible devices can be removed by the [http://u3-tool.sourceforge.net/ u3-tool utility].
==ZeroCD==
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