Patent ID: 8650373
Filing Date: 2014-02-11
Classification: G06F

Abstract:
1. A memory system comprising: a nonvolatile first memory in which a memory cell group per word line has a storage capacity for n (n≧2) pages; a nonvolatile second memory that temporarily stores user data write-requested from a host apparatus; a data-copy processing unit that executes, at predetermined timing, data copy processing including reading out, in page units, the user data stored in the second memory and sequentially writing the read-out user data in page units in the first memory; and a data invalidation processing unit that, after the data copy processing, leaves first user data valid in the second memory, the first user data being data copied to the word line that has an empty page of the first memory by the data copy processing, and invalidates second user data in the second memory, the second user data being data copied to the word line that has no empty page of the first memory by the data copy processing.