Memory system

A memory system comprising:

• a volatile memory;
• a nonvolatile memory configured to store management information indicating a storage location of data, a first pointer, and a second pointer;
• and
• a controller configured to read out at least one part of the management information from the nonvolatile memory into the volatile memory, and to manage data, and to update the management information,
• the first pointer indicating a storage location of the second pointer,
• the second pointer indicating a storage location of the management information, wherein
• the nonvolatile memory stores:
• backup information indicating contents of the management information, the management information being stored in the volatile memory;
• and
• update information indicating a change in the contents before and after updating the management information, wherein
• the controller is configured to control saving of the backup information or the update information, and to update the first pointer when the second pointer is updated multiple times.

A method of controlling a memory system comprising:

• storing management information for data management, a first pointer, and a second pointer in a nonvolatile memory;
• reading the first pointer to acquire a storage location of the second pointer;
• reading the second pointer to acquire a storage location of the management information;
• reading out at least one part of the management information from the nonvolatile memory into a volatile memory;
• updating the management information;
• saving backup information indicating contents of the management information;
• saving update information indicating a change in the contents before and after updating the management information;
• updating the second pointer;
• and
• updating the first pointer when the second pointer is updated multiple times.

A memory system comprising:

• a controller configured to manage data;
• and
• a nonvolatile memory configured to store management information, a first pointer, and a second pointer,
• the first pointer indicating a storage location of the second pointer,
• the second pointer indicating a storage location of a piece of information for data management in the nonvolatile memory, wherein
• the controller is configured to control saving of at least backup information or update information, and to update the first pointer when the second pointer is updated multiple times,
• the backup information indicating contents of the management information,
• the update information indicating a change in the contents.

A memory system comprising:

• a nonvolatile memory configured to store a piece of information for data management;
• and
• a controller configured to control updating of a first pointer when a second pointer is updated multiple times,
• the first pointer indicating a storage location of the second pointer,
• the second pointer indicating a storage location of the piece of information in the nonvolatile memory.