MEMORY SYSTEM AND METHOD OF CONTROLLING MEMORY SYSTEM

摘要

According to one embodiment, when loading of reverse lookup information from a nonvolatile first memory to a randomly accessible second memory has failed, a controller determines whether data at a first physical address is valid or invalid by using lookup information loaded from the first memory to the second memory.

主权项

1. A memory system comprising:
a nonvolatile first memory including a plurality of blocks as a unit of data erasing; a second memory that is randomly accessible; and a controller that performs data transfer between a host device and the first memory via the second memory, wherein the first memory stores therein a first address translation table for managing lookup information that associates a logical address specified by the host device with a physical address in the first memory, and a second address translation table for managing reverse lookup information that associates the physical address in the first memory with the logical address, wherein the controller is configured to , when loading of the reverse lookup information from the first memory to the second memory has failed, determine whether data at a first physical address is valid or invalid by using the lookup information loaded from the first memory to the second memory.