Abstract: A cord winder for winding a cord comprises a first structure having a bottomed cylindrical shape and a second structure rotatably held in the first structure. The second structure includes a circular base portion, a center cylindrical stud raised on a center of the circular base portion and radially extending ribs formed on an outer surface of the center cylindrical stud. The ribs are arranged to constitute a bobbin structure. The first and second structures are provided with a cord inserting groove through which the cord can be led to the bobbin structure when the first and second structures take mutually coincident positions. The cord is wound on the bobbin structure when relative rotation takes place between the first and second structures. A braking structure is employed for braking the relative rotation when an external force is applied to the first and second structures to induce the relative rotation.

Abstract: A data transfer unit for a small computer system which has a host computer and main and auxiliary storage units, transfers data between the host computer, and the main and auxiliary storage units. The data transfer unit transfers the data, which is outputted from the host computer, from the data buffer to both the main and auxiliary storage units simultaneously, in an operation mode in which data is transferred from the host computer to the storage units. When an error occurs in the main or the auxiliary storage unit, the data transfer unit transfers the correct data from the other storage unit which is operating normally, to a substitute address in the storage unit in which the error has occured.