A method, apparatus, and computer program product for setting and implementing a policy to compress the history of data on a temporal volume is described. The operational amplifier can be configured with a chopper stabilized current mirror configured within the output stage of the operational amplifier. The various rotor assemblies are organized in pairs, each pair having one rotor fitted with a telescoping support armend effector arrangement to support substrates thereon, and the other rotor fitted with inner and outer actuator arms that cooperate to effect radial movement of the corresponding end effector of the paired rotor assembly.