According to one embodiment, in a memory system, a controller is configured to write first data in a page in a block in response to a write request from a host, and update second information used to manage a correspondence between a logical address designated by the write request and a second physical address which is a storage location in the first memory. The controller is configured to perform a first process of updating the first information with the second information and storing the updated information in the first memory. The controller is configured to acquire the first physical address associated to a logical address designated by the write request from the first information. The controller is configured to store, in the first memory, third information including information in which the acquired first physical address and the second physical address are associated.