How Can I Control USB Transfer Rate?

USB basically defines three main transfer speeds- high speed which is around 480 Mbps, Full Speed which is 12 Mbps and Low Speed which is 1.5 Mbps. The low speed is generally used for keyboards, human interface devices and mice, the full speed is typically used for printers, digital cameras and the like and the high speed will usually support audio and video devices. The host controller will usually manage all transmissions and transactions. For this reason the host controller is also called the bus master. Therefore in order to control your USB transfer you will have to look in to the host controller.

USB stands for Universal Standard Bus. It is primarily a serial bus which is standard to most interface devices. It was originally devised to assist all parallel and serial ports since originally these were not standardized and basically required many device drivers to be maintained and developed.

There are basically four types of data transfers including bulk transfers, isochronous transfers, Interrupt transfers, and Control transfers.