Method and apparatus for accelerating a disc drive spindle motor from rest to a final operational velocity. The platen can have a platen base that is adaptable to receive either a circular platen top or a rectangular platen top. 7, having at least 8 carbon atoms and containing both methyl and ethyl branches. The intermediate layer has a first layer closest to the substrate, and a second layer formed on the first layer. A movable stop, in an active state, holds an envelope received in position for insertion of enclosures. The memories can be accessed by the second processor and, via a DMA channel, by the first processor.