Canon ZR90 Instruction Manual page 11

❍ The connection may not operate correctly if you are using other USB
devices, excluding USB mice or keyboards, at the same time. If this
occurs, disconnect the other devices from the computer and try
reconnecting the camcorder.
❍ Do not connect two or more camcorders to the same computer via the
USB interface. The connections may not operate correctly.
❍ Not all operations performed with a connection to a USB 2.0
compatible board can be guaranteed.
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