Storage device preventing loss of data in situation of lacking power and operating method thereof

Abstract

Disclosed is a storage device including a non-volatile memory that inputs or outputs data at a request of a host system, a volatile memory that temporarily stores data input to or output from the non-volatile memory, an internal spare power source that supplies power to a part of the volatile memory in response to main power supplied from the host system dropping to a first amount or less, and a storage controller that controls the non-volatile memory and the volatile memory. The storage controller is configured to divide the volatile memory into area-received-duplication-power, and at least one area-received-spare-power, in response to the main power dropping to the first amount or less, to redundantly supply spare power to the area-received-duplication-power from an external spare power source and the internal spare power source, and to supply the spare power to the at least one area-received-spare-power from the external spare power source.