Computer system to run the emulator that emulates the random access type of storage media to virtual sequential access type of storage medium

摘要

PROBLEM TO BE SOLVED: To improve the efficiency of the capacity of a random storage medium without affecting a higher-level program of the emulator that emulates the random storage medium on a virtual sequential medium.;SOLUTION: When an unnecessary data object exists in a virtual sequential medium, an emulator invalidates a random medium section storing the unnecessary data object in order to allow other data to be stored therein. When providing the unnecessary data object to a higher-level program, the emulator provides predetermined control information of smaller size than the unnecessary data object, in place of the unnecessary data object.;COPYRIGHT: (C)2011,JPO&INPIT