Abstract: A media processing device, controls such that when a medium is transported in the inserting direction by means of transporting means, the media information recorded on the medium is read by a media information read means and stored by recording to memory. Whether or not the medium is ejectable is determined by transporting the medium in the ejecting direction by means of the transporting means. The media information stored in memory is controlled so as to be deleted when it is determined that the medium is not ejectable. In this way, as long as it is not confirmed that the medium is ejectable, the media information recorded in the medium is not output to the host device.

Abstract: A media processing device, controls such that when a medium is transported in the inserting direction by means of transporting means, the media information recorded on the medium is read by a media information read means and stored by recording to memory. Whether or not the medium is ejectable is determined by transporting the medium in the ejecting direction by means of the transporting means. The media information stored in memory is controlled so as to be deleted when it is determined that the medium is not ejectable. In this way, as long as it is not confirmed that the medium is ejectable, the media information recorded in the medium is not output to the host device.

Abstract: A method for modifying program of a magnetic tape unit comprising a flash memory for storing programs a storage memory and a CPU for executing the programs stored in the flash memory and storage memory is provided. The method comprises steps of storing a program for rewriting program in the storage memory, making a discrimination when a magnetic tape is mounted in the magnetic tape unit whether the magnetic tape is a normally used recording medium or a medium for modifying program, reading a program to be modified reproduced from the magnetic tape into a buffer when the magnetic tape is the medium for modifying program, and erasing the contents of the flash memory by the CPU by use of the program for rewriting program stored in the storage memory to transfer the program to be modified from the buffer to the flash memory.