Patent EP-0669751-A2 (EP)
Inventor: KUBO RYOJI C O CANON K K
IPC: G11C16/10
Filed: 1995-02-22
Abstract: There is provided a data processing apparatus which comprises an inputting part for inputting information data, a recording part for recording the information data on a recording medium which needs to be subjected to an information-data erasing operation before the information data is recorded on the recording medium, an erasing part for erasing unnecessary information data from the recording medium, and a controlling part for executing control to cause the erasing part to erase the unnecessary information data from the recording medium while the recording part is not recording the information data. There is also provided a data processing apparatus which comprises a detecting part for detecting whether a recording medium incapable of being overwritten has been attached, and an erasing part for erasing information data from a predetermined area of the recording medium according to an output of the detecting part. There is also provided a data processing apparatus arranged to record information data by using a recording medium incapable of being overwritten, which apparatus comprises an erasing part for executing an erasing operation for erasing unnecessary information data recorded on the recording medium and a controlling part for controlling the erasing operation of the erasing part in response to an activation of a power source. There is also provided a recording unit which comprises a recording medium on which to record information data, a detecting part for detecting durability of the recording medium, and a controlling part for controlling access to the recording medium according to an output of the detecting part. There is also provided a data processing apparatus which comprises an inputting part for inputting information data, an access part for performing access to a recording medium to record the information data, a detecting part for detecting durability of the recording medium, and a controlling part for controlling the access of the access part according to an output of the detecting part. There is also provided a recording unit which comprises a recording medium incapable of being overwritten and a controlling part for detecting whether a predetermined area on the recording medium is a data-erased area. There is also provided a recording system which comprises a recording medium which needs to be subjected to an information-data erasing operation before recording of information data and a recording device for recording the information data on the recording medium, the recording medium including a first recording area in which to record the information data, a second recording area in which to record data indicative of an erased area in the first recording area in which to record the information data, and a third recording area in which to record data indicative of a use status of each area in the first recording area, the recording device being arranged to detect from the recording medium the data recorded in the second recording area and the data recorded in the third recording area, and perform erasure of, and recording of the information data in, a recording-enable and unerased area in the first recording area. There is also provided a data processing apparatus which comprises a recording medium which needs to be subjected to an erasing operation before recording of information data, a recording part for recording the information data in a predetermined area of the recording medium, a detecting part for detecting whether the predetermined area of the recording medium is an erased area, an erasing part for erasing information data recorded on the recording medium, and a controlling part for controlling the erasing part according to an output of the detecting part. There is also provided a data processing apparatus which comprises a recording medium including a first recording area in which to record information data and a second recording area in which to record data indicative of a use status of each area in the first recording area, and a controlling part for performing recording or erasure of the information data on or from the recording medium, the controlling part being arranged to erase an area of the first recording area in which no valid information data is recorded, the area being detected on the basis of the data recorded in the second recording area, and rewrite with a predetermined value the portion of the recording area that corresponds to the erased area of the first recording area. There is also provided a recording medium which comprises a first recording area in which to record information data and a second recording area in which to record data indicative of a data-erased area in the first recording area. There is also provided a recording medium which comprises a first recording area in which to record information data and a second recording area in which to record data indicative of a use status of each area in the first recording area, data identical to the data recorded in the second recording area being recorded in the first recording area.