Semiconductor storage device

摘要

According to the embodiments, a first storage area and a second storage area specified by a trim request is managed by a first management unit, and the second storage area specified by the trim request is managed by a second management unit. A block in which data of the first management unit are all specified by the trim request from the first or second storage areas and a block in which data of the second management unit are all specified by the trim request from the second storage area are released.

主权项

1. A semiconductor storage device comprising:
a first storage area that includes a plurality of blocks; a second storage area that includes a plurality of blocks; and a controller, the controller being configured to:
manage, by a first management unit, first data, the first data being stored in the first storage area, the first management unit being larger than a sector;manage, by a second management unit, second data, the second data being stored in the second storage area, the second management unit being larger than the first management unit, and equal to or smaller than a block;manage, by the first management unit, whether the first data is specified by a trim request;manage, by the first management unit and the second management unit, whether the second data is specified by the trim request;release a first block from the first storage area, the first block being filled with third data, the third data being the first data specified by the trim request, the third data being data managed by the first management unit;release a second block from the second storage area, the second block being filled with fourth data, the fourth data being the second data specified by the trim request, the fourth data being data managed by the first management unit; andrelease a third block from the second storage area, the third block being filled with fifth data, the fifth data being the second data specified by the trim request, the fifth data being data managed by the second management unit.