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How to Use a Camera USB Port: Tips & Warnings:
Some digital video and still photo cameras come with a built-in USB port. This USB port allows you to connect the camera to a computer for the purpose of transferring photos and video from the camera to the computer. The computer can recognize the storage drive in the camera and treats it as an external drive. Some cameras also come with additional software for transferring and editing images and video.

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USB's electrical design doesn't allow it. When USB was designed, a decision was made to handle the propagation of electromagnetic fields on USB data lines in a way that limited the maximum length of a USB cable to something in the range of 4m. This method has a number of advantages and, since USB is intended for a desktop environment, the range limitations were deemed acceptable.
A number of cable vendors seem to have reached the conclusion that USB is like a PC's serial port, only faster, so you need all sorts of special hardware to create the USB connection you need to make. This is completely incorrect. The only kind of cables you'll ever need to connect normal USB products are A to B cables, A to mini B cables or mini A to mini B cables of various lengths. Some special kinds of devices use nonstandard connectors and so come with their own special cable.
Generally speaking, USB cables are classified into one of two different bandwidth groups: 1.1, which transfers data at a maximum rate of 1.5 Mbit per second, and 2.0, with a 480 Mbit per second data transfer rate. USB 2.0 is backward compatible with the lower data transmission requirements of 1.1, but the substitution can't be reversed; 1.1 just can't deliver the rate of data transfer that USB 2.0-rated devices need. In addition to the bandwidth classifications listed above, USB devices can also be labeled in the following "speed" categories, which specify the amount of bandwidth they need to operate:
1. Low Speed: The " low speed" rating indicates that a device requires minimal bandwidth (1.5 Mbit/s) to function, so it can be used in conjunction with either 1.1 or 2.0 USB cables. Joysticks, keyboards and computer mice are a few common examples of low speed devices.
2. Full Speed: Devices labeled "full speed" need a signal rate of 12 Mbit per second. Since this is such a common bandwidth requirement, all USB hubs on the market have been designed to support Full Speed. And even though the data transfer speed is higher, Full Speed - like Low Speed - transmits equally well via 1.1 or 2.0 USB cables.
3. High Speed: " High speed" USB devices run at 480 Mbit per second, and require a 2.0-rated USB cable.