A data storing method and a memory controller and a memory storage apparatus using the same are provided. The method includes logically grouping physical erase units into a data area and a spare area; selecting a physical erase unit form the spare area as a first data collecting unit; and selecting a physical erase unit from the spare area as a second data collecting unit. The method also includes writing data received from a host into the first data collecting unit. The method further includes performing a data arranging operation to move valid data in a third physical erase unit to the second data collecting unit and associating the third physical erase unit with the spare area. Accordingly, the method can effectively enhance the performance of the write operation.

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