MODULAR DISC DRIVE ARCHITECTURE

A data storage device control module for controlling operational processes in a data storage device comprises a number of preemptive modules, a number of non-preemptive modules, and a scheduler module operable to schedule the execution of the non-preemptive modules only in the data storage device control module. Preferably included as one of the non-preemptive modules is a queue processor module operable to manage the position and movement of command nodes in multiple command node queues.