L2P mapping table reconstruction method and solid state disk

The invention discloses an L2P mapping table reconstruction method and a solid state disk, a plurality of data, continuous logic addresses and count values in each data block are stored in a plurality of 4K cells of a physical block according to a continuous programming sequence, and the L2P mapping table reconstruction method comprises the following steps: reading the last 4K cell of the physical block when power is on after abnormal power failure, obtaining a first last logic address and a first last count value stored in the first last logic address; calculating a first first physical address of the first data by using the array table; and establishing an L2P mapping table according to the corresponding relationship between the first first logic address and the first first physical address of the first data. According to the method, a count value is also stored during data storage, so that the count value and the logic address of the last data stored in the physical block can be obtained when the last 4K cell is read, and the address mapping relation of the first data can be obtained through the array table, so that the L2P mapping table is recovered, the reading frequency is reduced, the power-on table building time is saved, and the working efficiency is improved. The power consumption is reduced.