A computer implemented method, system, and computer usable program code for classifying a data stream using high-order models. This results in a capability of minimizing an electric field concentration in the gate oxide film, i. Afterwards, a filler is formed at least in the trench and a planarization process is then performed on the filler. Each memory cell further has a stack of floating gate and select gate extending over the channel region, the select gate of the cells along each row being connected together to form a wordline. The conductive layer includes a conductive pattern, and a reference portion serving as a positioning reference for placing the suspension board with circuit on a load beam. In some examples the data flow may have been split into a plurality of data streams separately or jointly including forward error correction.