Memory system

摘要

A memory system includes a volatile first storing unit, a nonvolatile second storing unit in which data is managed in a predetermined unit, and a controller that writes data requested by a host apparatus in the second storing unit via the first storing unit and reads out data requested by the host apparatus from the second storing unit to the first storing unit and transfers the data to the host apparatus. The controller includes a management table for managing the number of failure areas in a predetermined unit that occur in the second storing unit and switches, according to the number of failure areas, an operation mode in writing data in the second storing unit from the host apparatus.

主权项

1. A memory system comprising:
a nonvolatile memory including a plurality of blocks; and a controller configured to count a number of bad blocks in the nonvolatile memory, wherein, in a case that the number of counted bad blocks in the nonvolatile memory has reached a first threshold, a warning indication is issued, in a case that the number of counted bad blocks in the nonvolatile memory has reached a second threshold, a data write operation to the nonvolatile memory is prohibited, the first threshold being less than the second threshold, wherein, immediately after power is turned on and before the memory system is started, the controller inspects an internal state of the controller and refers to the number of counted bad blocks in the nonvolatile memory, and in a case that the number of counted bad blocks in the nonvolatile memory has reached the second threshold, the controller controls the nonvolatile memory so that the nonvolatile memory is started in a read only mode.