Patent ID: 6763427
Filing Date: 2004-07-13
Classification: G11B

Abstract:
A tape apparatus having at least one head for writing and reading data to/from a tape medium, a drive mechanism for repositioning a tape medium along a longitudinal direction of the tape medium, and memory for storing volume management information indicating a recording position of at least one data item stored on a tape medium, said apparatus comprising:a command queue for storing a plurality of access instructions from a host apparatus; control means for selecting instructions stored in said command queue and placing said instructions in an execution queue; and reordering means for reordering said instructions stored in said execution queue according to a predetermined set of rules using said volume management information; wherein said reordering means examines each instruction in said execution queue, and preferentially executes instructions which are late in a descending order such that instructions having a calculated value are executed prior to instructions having a lesser calculated value.