Data Storage Device and Flash Memory Control Method

摘要

A flash memory control technology with high efficiency, which records a logical page table in a random access memory. The logical pages that have been collected from a data-interspersed block into a destination block of a flash memory are recorded in the logical page table. Without accessing a logical-to-physical address mapping table stored in the flash memory, the physical pages in the data-interspersed block corresponding to the logical pages recorded in the logical page table are regarded as containing invalid data.

主权项

1. A data storage device, comprising:
a flash memory, providing a storage space that is divided into a plurality of physical blocks with each physical block further divided into a plurality of physical pages; and a control unit, comprising a microcontroller and a random access memory, coupled between a host and the random access memory; wherein: the microcontroller is configured to record a logical page table in the random access memory to indicate logical pages that have been collected from a data-interspersed block between the plurality of physical blocks into a destination block between the plurality of physical blocks; and the microcontroller is further configured to regard the physical pages within the data-interspersed block corresponding to the logical pages recorded in the logical page table as containing invalid data without downloading a logical-to-physical address mapping table from the flash memory to determine whether the physical page contains valid data or invalid data based on the logical-to-physical address mapping table.