A disk performance optimizing algorithm by adjusting the native command queue based on rotational position

The improvement of disk access scheduling policies was one of important means to raise disk access performance. Serial ATA storage equipment couldn't meet network access and service's time-constrained characteristics which scheduled disk access in native command queue based on rotational position ordering (RPO). According to access's the latest deadline time, deadline sensitive and first (DSF) classified storage access into various service queue and schedule, which optimized the embedded scheduling policy. The emulation results had proved it valid to meet the storage access's requirements.