| 摘要 |
An image forming apparatus having a unit with a non-volatile memory provided in a toner cartridge. By controlling the method in which data is written to a non-volatile memory, data that has been rewritten in the memory due to malfunction can be restored. The apparatus includes a detector for detecting the amount of toner remaining in the cartridge. On the basis of this information, a memory controller writes data, which indicates that cartridge replacement is necessary, to a prescribed area of the non-volatile memory. A memory locking unit inhibits rewriting of this area once data has been written. If it is judged by the memory controller that rewriting of the data halted in mid-course, write-protect by the memory lock function unit is cancelled and rewrite is allowed to be completed again, after which rewrite is inhibited.
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