Method of dynamically switching partitions, memory card controller and memory card storage system

A method of dynamically switching partitions, for a memory card having a memory card controller and a plurality of physical blocks, the method comprising:

• configuring a plurality of logical blocks for mapping to at least a portion of the physical blocks by the memory card controller;
• dividing the logical blocks into a first partition and a second partition by the memory card controller;
• setting a card specific data (CSD) corresponding to the memory card as a first default value corresponding to the first partition by the memory card controller;
• requesting the CSD corresponding to the memory card by a host system, so as to obtain the first default value from the memory card when the memory card is coupled to the host system, wherein the host system can recognize and access the first partition based on the first default value;
• transmitting a switch command to the memory card controller by the host system;
• receiving the switch command and transmitting a response message corresponding to the switch command to the host system by the memory card controller;
• setting the CSD corresponding to the memory card as a second default value corresponding to the second partition in response to the switch command by the memory card controller;
• and
• re-requesting the CSD corresponding to the memory card by the host system, so as to obtain the second default value from the memory card in response to the response message, wherein the host system can recognize and access the second partition based on the second default value.

A memory card storage system, comprising:

• a host system;
• and
• a memory card, wherein the memory card comprises:
• a connector, configured to couple to the host system;
• a memory module, having a plurality of physical blocks, each of the physical blocks has a plurality of physical pages and the physical pages belonging to the same physical block are written individually and are erased simultaneously;
• and
• a memory card controller, coupled to the memory module and the connector, and configured to:
• configure a plurality of logical blocks for mapping to at least a portion of the physical blocks;
• divide the logical blocks into a first partition and a second partition;
• set a card specific data (CSD) corresponding to the memory card as a first default value corresponding to the first partition, wherein the host system requests the CSD corresponding to the memory card, so as to obtain the first default value from the memory card, wherein the host system can recognize and access the first partition based on the first default value;
• receive a switch command from the host system;
• record a switch flag in a random access memory of the memory card as well as not transmitting a response message corresponding to the switch command to the host system in response to the switch command, wherein the host system resets the memory card with an uninterruptible power supply manner in response to not transmitting the response message corresponding to the switch command by the memory card controller;
• determine whether the switch flag is recorded in the random access memory by the memory card controller after the memory card is reset;
• and
• set the CSD corresponding to the memory card as a second default value corresponding to the second partition if the switch flag is recorded in the random access memory after the memory card is reset, wherein the host system requests the CSD corresponding to the memory card, so as to obtain the second default value from the memory card after the CSD corresponding to the memory card is set as the second default value corresponding to the second partition, wherein the host system can recognize and access the second partition based on the second default value.

A memory card controller, for controlling a memory module of a memory card, wherein the memory module has a plurality of physical blocks, each of the physical blocks has a plurality of physical pages and the physical pages belonging to the same physical block are written individually and are erased simultaneously, the memory card controller comprising:

• a host interface, configured to couple to a host system;
• a memory interface, configured to couple to the memory module;
• and
• a memory management circuit, coupled to the host interface and the memory interface, wherein the memory management circuit is configured to:
• configure a plurality of logical blocks for mapping to at least a portion of the physical blocks;
• divide the logical blocks into a first partition and a second partition;
• set a card specific data (CSD) corresponding to the memory card as a first default value corresponding to the first partition, wherein the host system can recognize and access the first partition based on the first default value;
• receive a switch command from the host system;
• record a switch flag in a random access memory of the memory card as well as not transmitting a response message corresponding to the switch command to the host system in response to the switch command;
• determine whether the switch flag is recorded in the random access memory by the memory card controller after the memory card is reset;
• and
• set the CSD corresponding to the memory card as a second default value corresponding to the second partition if the switch flag is recorded in the random access memory after the memory card is reset, wherein the host system can recognize and access the second partition based on the second default value.