Storage card

本发明公开了一种确保高速数据写入操作的存储卡。该存储卡由可擦可编程非易失性存储器和控制电路构成。这种非易失性存储器的存储器阵列具有包括第一标志的擦除表，该标志指示出存储区在每个擦除单元内是否是空白区，控制电路在写有可擦除数据的存储器区数目变为常值时，执行预擦除控制，以便根据指示空白区的第一标志预先擦除存储区上的可擦除数据。由于预先对空白区执行擦除处理，因此使在利用空白存储器区实施数据写入处理之前插入擦除处理的必要性下降了，借此可提高数据写入存储卡的速度。 Disclosed is a memory card which ensures high-speed data writing operations. The memory card is formed of an erasable and programmable nonvolatile memory and a control circuit. A memory array of the nonvolatile memory has an erasing table including a first flag designating whether a memory area is a vacant area or not in every erasing unit. The control circuit exercises, when the number of memory areas in which the erasable data is written becomes a constant value, pre-erasing control to previously erase the erasable data over the memory area depending on the first flag indicating a vacant area. Since the erasing process is previously executed to the vacant memory area, necessity for insertion of the erasing process just before the writing process using the vacant memory area can be reduced and thereby writing data to the memory card can be highly speeded.