Memory system

A memory system comprising:

• a volatile first storing unit;
• a nonvolatile second storing unit including a memory cell that can store data;
• and
• a controller that performs data transfer between a host apparatus and the second storing unit via the first storing unit, stores management information including a storage position of the data stored in the second storing unit during a startup operation into the first storing unit, and performs, while updating stored management information, data management in the first and second storing units based on the stored management information, wherein
• the management information in a latest state stored in the first storing unit is also stored in the second storing unit and read from the second storing unit by the controller during the startup operation and includes
• a snapshot in which the first management information of the first storing unit is stored when a predetermined condition is satisfied,
• a pre-log as difference information before and after the management information is changed, the pre-log being generated before a change occurs in the management information, and
• a post-log concerning the change in the management information, the post-log being generated after the change occurs in the management information, and
• the second storing unit stores therein, in order from a continuous area of the pre-log and a continuous area of the post-log respectively already stored before the snapshot in different erasing unit areas in the second storing unit are stored, the pre-log and the post-log in a same area in the respective erasing unit areas.

A memory system comprising:

• a volatile first storing unit;
• a nonvolatile second storing unit including a memory cell that can store multi-value data;
• and
• a controller that performs data transfer between a host apparatus and the second storing unit via the first storing unit, stores management information including a storage position of the data stored in the second storing unit during a startup operation into the first storing unit, and performs, while updating the stored management information, data management in the first and second storing units based on the stored management information, wherein
• the second storing unit also stores therein the management information that has been stored in a latest state into the first storing unit,
• the management information in the latest state is read by the controller during the startup operation and includes
• a snapshot in which the first management information of the first storing unit is stored when a predetermined condition is satisfied,
• a pre-log as difference information before and after the management information is changed, the pre-log being acquired before a change occurs in the management information, and
• a post-log as difference information before and after the change of the management information, the post-log being acquired after the change occurs in the management information.