Abstract: A data compression method is disclosed. The data compression method is applied to a flash memory device having a flash memory medium. The data compression method includes: reading at least two pieces of cold data in the flash memory medium; compressing the at least two pieces of cold data in the flash medium, so as to obtain at least two pieces of compressed data; splicing the at least two pieces of compressed data, so as to generate at least one write unit; and writing each of the at least one write unit into the flash memory medium.

Abstract: A cache management method, a solid state drive controller, and a solid state drive are provided. The solid state drive comprises a cache space, and the cache space comprises a dirty data block linked list. The method comprises: obtaining a write command and generating a first dirty data block used to record data information of the write command; and if the first dirty data block conflicts in address range with a second dirty data block in the dirty data block linked list, marking data in the conflicting region of the second dirty data block as invalid and inserting the first dirty data block into the dirty data block linked list.