Patent ID: 6161195
Filing Date: 2000-12-12
Classification: G11C

Abstract:
A memory card device using an EEPROM as a semiconductor memory, comprising:a storage area divided into a plurality of space blocks, said space blocks each including EEPROM memory cells; anddata relieving means for creating a first data relieving area by locating and identifying a predetermined number of space blocks in said storage area if and when data can not be successfully written into a first data write-in defective area in said storage area, and writing data instead into the first data relieving area, said data relieving means creating a second data relieving area by locating and identifying another predetermined number of space blocks in said storage area if and when the first data relieving area becomes full and data can not be successfully written into a second data write-in defective area in said storage area, and writing data instead into the second data relieving area.