| 摘要 |
Before an optical disk is inserted into an electronic filing system, one of three mode-setting keys provided on a keyboard is pushed, thereby setting an automatic mode for permitting automatic updating of retrieval data items, an inhibit mode for inhibiting the automatic updating of retrieval data items, and a select mode for selecting the automatic updating of retrieval data items or the inhibition thereof. The mode, thus set, is recorded on a magnetic disk. When the optical disk is inserted into the system, the mode is read from the magnetic disk. The mode read from the magnetic disk controls the updating of the retrieval data items recorded on the magnetic disk.
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