Flash memory device and data reading method thereof

Abstract

The invention provides a quick flashing memory device. The quick flashing memory device is characterized by comprising a flash memory, a random access memory (RAM) and a controller. The flash memory comprises a plurality of blocks. The RAM is used for storing a reading time record table which is used for recording read times of the blocks. When a plurality of read times, corresponding to the plurality of original blocks, in the read time record table exceed a boundary value, the controller obtains a plurality of blank blocks to enable the blank blocks to serve as a plurality of image blocks which respectively correspond to the original blocks, and copies one of a plurality of data pages stored in the original blocks to the corresponding image blocks every time the original blocks are read until the data pages stored in the original blocks are all copied to the corresponding image blocks.

Description

technical field [0001] The present invention relates to flash memories, and in particular to data reading from flash memories. Background technique [0002] Flash memory is often used in general electronic devices to store data. The flash memory includes a plurality of blocks for storing data. Since the flash memory can keep the data stored therein without power supply, and the portable electronic device has only limited power supply, the flash memory is particularly suitable for data storage of the portable electronic device. [0003] A general flash memory controls its data access via a controller. When a host sends a write command to the controller, the controller writes data into the flash memory according to the write command. When a host sends a read command to the controller, the controller reads data from the flash memory according to the read command, and then sends the data back to the host. [0004] When reading data from the flash memory, the host often reads...

AI Technical Summary

Problems solved by technology

However, general blocks can only tolerate a fixed number of reads

When the number of times a block is read exceeds a threshold value (for example, 100,000 times), the data stored in the block is prone to errors after being read

However, the controller cannot control the host's data reading behavior, and can only read specific blocks according to the host's read command

Because the data read at high frequency is very important system data, it is easy to make serious errors in the system data

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