Method for prolonging SSD life cycle

The invention provides a method for prolonging the life cycle of an SSD (Solid State Disk), which comprises the following steps of: S1, encoding an N-bit sequence of a flash memory unit of the SSD into 2N encoding groups corresponding to 2N reference voltages Ngt; 1 is a positive integer; s2, mapping the coding groups to k-bit data, and obtaining M rewriting groups, 0 lt; klt; n, k and M are positive integers; and S3, writing the data into the flash memory unit based on the M rewriting groups, wherein only k bits can be written each time. According to the method, the bit of each flash memory unit is recoded, so that each flash memory unit can be rewritten for multiple times before being erased, the erasure times of the flash memory units are reduced, and the life cycle of the whole SSD is prolonged. 本发明提出一种提高SSD生命周期的方法，提高SSD生命周期的方法包括如下步骤：S1、将SSD的闪存单元N比特位序列编码成2N个编码组，对应2N个参考电压，N>1，为正整数；S2、将编码组映射到k比特位的数据，获得M个重写组，0