A method for forming a metal interconnect comprises exposing a dielectric layer to an etch chemistry containing nitrogen-containing compound such as NH3, NF3 or N2O. A crystalline form of one or more carotenoids is processed in a fluidized bed coating machine where a protective coating of a sugar or polyhydric alcohol, a starch, and optionally a protein, is applied. A plurality of retaining tabs extends from each conductive cage to pass through corresponding slots defined through the connecting cover. The frequency of the ripple is synchronized with the selection frequency of line-sequential driving. A servo write module writes the servo data on the disk. When the data storage device slides in the case, the position of the opening is in line with the position of the securing hole thereof.