| 摘要 |
<p>In an optical information storage apparatus (100) including an optical information storing medium (50) having a retrieval index storing area and an information storing area, the apparatus comprises an optical head (10) for recording and reading information on and from the optical information storing medium (50) and a signal generator (101) for generating a delete signal to the optical head in order to directly or perfectly delete (destroy) information recorded on the information area of the storing medium, in addition to the indirect deletion of a retrieval index. Further, the above direct and. indirect deletions can be selected by the operator. The above apparatus is useful in particular to delete confidential documents stored in a picture information filing system, for instance.</p> |
