3 results about "Logical address" patented technology

The embodiment of the invention discloses a data reading method and device. The method comprises the steps that an initial logical address of target data and the total length of the logical address are calculated; FTL is inquired, and an initial physical address and the total length of continuous physical blocks are obtained; whether the total length of mapped continuous physical blocks is larger than or equal to the total length of the logical address or not is judged; if yes, the initial physical address serves as the starting point, the physical address with the corresponding length is read backwards according to the total length of the logical address, if not, the initial physical address serves as the starting point, IO is split into the corresponding physical block length and residual logical address size according to the recorded physical address total length, the data of physical block length is read, then, the physical address is continuously matched with the IO residual logic address size, the frequency of accessing the FTL can be reduced only when the recorded continuous block address is larger than the unit mapping granularity, the inquiring time is shortened, and the SSD performance is improved.

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.