说明：  包括好几款u盘原理图，有现代级三星两家u盘闪存的使用原理图，主控芯片有2款，还附有u盘电路一些可选用的电路，以及选用的电路变更。
(Includes several schematic diagram of u disk, modern two level Samsung u disk Flash using a schematic diagram, master chip has 2 different versions, accompanied by u circuit can use circuits, selection and circuit changes.)