The invention introduces a method for dynamic partitioning, performed by a processing unit, including at least the following steps. A storage-unit ID (identifier) associated with a storage unit is acquired, where the storage unit is coupled to the processing unit. Parameters corresponding to the storage-unit ID are obtained and the length of a physical super-page is calculated according to the parameters. The length of a data buffer is obtained and the quantity of logical partitions is calculated according to the length of the physical super-page and the length of the data buffer. The quantity of logical partitions is stored in a DRAM (Dynamic Random Access Memory).