A development subsystem is used to develop toner particles transported by
semiconductive carrier particles. The development subsystem includes a
developer housing for retaining a quantity of developer having
semiconductive carrier particles and toner particles, a first magnetic
roll having a stationary core with at least one magnet and a sleeve that
rotates about the stationary core of the first magnetic roll, a second
magnetic roll having a stationary core with at least one magnet and a
sleeve that rotates about the stationary core of the second magnetic
roll, a motor coupled to the first and the second magnetic rolls to drive
the rotating sleeves of the first and the second magnetic rolls at
different velocities relative to a velocity for a photoreceptor that
rotates in proximity to the first and second magnetic rolls, the first
and second magnetic rolls being driven in a direction that is with the
direction of rotation of the photoreceptor so that the first and the
second magnetic rolls carry semiconductive carrier particles and toner
particles through a development zone formed by the first and the second
magnetic rolls that is proximate to the photoreceptor.