| 摘要 |
A recording medium has clusters assigned first cluster information pieces respectively. The clusters store a file or files of image data. When a received signal is a copying command indicative of a requested file, image data in the requested file is read from one or more clusters and is sent. Detection is made about a first cluster information piece or pieces assigned to the one or more clusters from which the image data is read. The detected first cluster information piece or pieces are labeled as a second cluster information piece or pieces. Identification is made about a first cluster information piece or pieces assigned to one or more clusters loaded with image data in the requested file. When the identified first cluster information piece or pieces are equal to the second cluster information piece or pieces, the requested file is recognized as a file which has been copied.
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