Memory management method, memory storage device and memory control circuit unit

A memory storage device, comprising:

• a connection interface unit configured to be coupled to a host system;
• a rewritable non-volatile memory module;
• and
• a memory control circuit unit coupled to the connection interface unit and the rewritable non-volatile memory module,
• wherein the rewritable non-volatile memory module comprises a plurality of physical units, the physical units comprise a plurality of first type physical units and a plurality of second type physical units, the first type physical units adopt a first operation mode, and the second type physical units adopt a second operation mode,
• the memory control circuit unit is configured to:
• group a part of physical units in the second type physical units to a first reserved region and a second reserved region, wherein the physical units belonging to the first reserved region and the second reserved region are reserved for usage in a data merging operation;
• and
• perform a first data merging operation, comprising:
• instructing to collect first data from a source unit in the physical units;
• selecting a target unit from the first reserved region or the second reserved region according to an attribute of the source unit;
• and
• instructing to store the first data to the target unit.

A memory control circuit unit, configured to control a rewritable non-volatile memory module, wherein the rewritable non-volatile memory module comprises a plurality of physical units, the physical units comprise a plurality of first type physical units and a plurality of second type physical units, the first type physical units adopt a first operation mode, the second type physical units adopt a second operation mode, and the memory control circuit unit comprises:

• a host interface configured to be coupled to a host system;
• a memory interface configured to be coupled to the rewritable non-volatile memory module;
• and
• a memory management circuit coupled to the host interface and the memory interface,
• wherein the memory management circuit is configured to:
• group a part of physical units in the second type physical units to a first reserved region and a second reserved region, wherein the physical units belonging to the first reserved region and the second reserved region are reserved for usage in a data merging operation;
• and
• perform a first data merging operation, comprising:
• instructing to collect first data from a source unit in the physical units;
• selecting a target unit from the first reserved region or the second reserved region according to an attribute of the source unit;
• and
• instructing to store the first data to the target unit.