Tips for Heavily Oxidized Aluminum. First of all, determine the extent of oxidation on the aluminum surface. If it is determined that the surface is in relatively good shape, i.e. light oxidation, then skip this step and move on to polishing with Flitz.
Q1: How long of a cable can I use to connect my device? A1: In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).
The max cable length recommended between a USB computer and USB interface is 5 meters (16.5 feet). Longer runs can be achieved through the use of powered USB hubs - up to 100 feet is then possible. Its about 5 metres. You can get longer cables but I wouldn`t bother, look at alternative solutions cat5 or wireless maybe.