Control modules, multi-level data storage devices, multi-level data storage methods, and computer readable media

A control module for a multi-level data storage device having a plurality of memory devices, the control module comprising:

• an access determination circuit configured to determine that access has been made to a piece of data stored on at least one of the plurality of memory devices, the piece of data associated with a level comprising one of a first level, a second level, or a third level;
• a level management circuit configured to change the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data;
• a memory controller configured to promote the piece of data in response to whether the level comprises the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices;
• and
• a level reconstruction circuit configured to reconstruct the level to which the piece of data is associated after loss of information on the level to which the piece of data is associated;
• wherein the level reconstruction circuit is configured to reconstruct the level based on metadata associated with the file.

A computer readable medium comprising instructions which, when executed by a processor, make the processor perform a multi-level data storage method, the multi-level data storage method comprising:

• determining that access has been made to a piece of data stored on at least one of a plurality of memory devices, the piece of data associated with a level comprising one of a first level, a second level, or a third level;
• changing the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data;
• promoting the piece of data in response to whether the level comprises the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices;
• and
• reconstructing, based on metadata associated with the file, the level to which the piece of data is associated after loss of information on the level to which the piece of data is associated.

A multi-level data storage device comprising:

• a plurality of memory devices;
• an access determination circuit configured to determine that access has been made to a piece of data stored on at least one of the plurality of memory devices, the piece of data associated with a level comprising one of a first level, a second level, or a third level;
• a level management circuit configured to change the level from the third level to the second level or from the second level to the first level upon determining that access has been made to the piece of data;
• and
• a memory controller configured to promote the piece of data in response to whether the level comprises the first level, the second level or the third level, wherein at least two levels of the first level, the second level, and the third level are associated with one of the plurality of memory devices;
• and
• a level reconstruction circuit configured to reconstruct, based on metadata associated with the file, the level to which the piece of data is associated after loss of information on the level to which the piece of data is associated.