Abstract: A light source unit for thermally-assisted magnetic head includes a substrate member having a bonding surface, multiple layers formed on the bonding surface and comprising a base layer, a connection pad layer, an insulation layer and a bonding layer; a light source assembly attached on the bonding layer of the substrate member and having a laser diode embedded therein and connected to the connection pad layer on the bonding surface, so as to form a laser diode circuit; and a heater buried in the insulation layer and connected to the connection pad layer, so as to form a heater circuit. The light source unit can maintain stable heat power for facilitating performance of the thermally-assisted magnetic head, and further reduce the sizes of the light source unit and substrate member.

Abstract: A method for evaluating bit error rate for a magnetic head by using a quasi-static test system, includes step (a), measuring a noise characteristic curve for a magnetic head, and the noise characteristic comprising noise amplitude and maximum noise amplitude; step (b), constructing a noise waveform by appropriately scaling a signal noise ratio of the magnetic head based on the noise characteristic curve measured in step (a); and step (c), injecting the noise waveform constructed in step (b) into a model comprising a transmitter module and a receiver module to evaluate a bit error rate. The method saves testing time, reduces manpower, and obtains accuracy testing result.

Abstract: A data transmission network is disclosed which includes a plurality of nodes each adapted to send a packet of data. A controller, or hub, is connected to each of the plurality of nodes for immediately relaying a packet from one of the nodes to a desired destination when it is the only packet received by the controller means. However, when a plurality of packets are simultaneously received by the controller from plural nodes, the controller immediately relays a selected packet, and temporarily stores the other packets for subsequent transmission.