A direct access storage system includes at least one disk and a controller. The at least one disk physically may be partitioned into at least one first access performance partition and at least one other access performance partition. The controller may be configured to process I/O accesses to the first access performance partition without regulation and regulate I/O accesses to the at least one other access performance partition.

 
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< Programmatically pre-selecting specific physical memory blocks to allocate to an executing application

< Data transfer control system

> Interface circuit for selectively latching between different sets of address and data registers based on the transitions of a frequency-divided clock

> Ambiguous virtual channels
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