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

A storage device comprising:

• a non-volatile memory configured to input or output data at a request of a host system;
• a volatile memory configured to temporarily store data input to or output from the non-volatile memory;
• and
• a storage controller configured to control data input or data output of the non- volatile memory and the volatile memory,
• wherein the storage controller is configured to
• in response to main power from the host system dropping to a first amount or less, supply spare power to the volatile memory through a spare power source,
• divide the volatile memory into pieces of area-received-spare-power, and
• differentially supply spare power to the pieces of area-received-spare-power based on a remaining amount of power of the spare power source, and
• wherein the storage controller is further configured to individually supply the spare power to the pieces of area-received-spare-power.

A storage device comprising:

• a non-volatile memory configured to input or output data at a request of a host system;
• a volatile memory configured to temporarily store data input to or output from the non-volatile memory;
• an internal spare power source configured to supply power to a part of the volatile memory in response to main power from the host system dropping to a first amount or less;
• and
• a storage controller configured to control data input or data output of the non- volatile memory and the volatile memory,
• wherein, in response to the main power from the host system dropping to the first amount or less, the volatile memory includes
• area-received-duplication-power configured to redundantly receive spare power from the internal spare power source and at least two external spare power sources among a plurality of external spare power sources, and
• at least two pieces of area-received-spare-power, each piece of area-received-spare-power individually receiving the spare power from one of the at least two external spare power sources, and
• wherein the internal spare power source is included in the storage device, and the at least two external spare power sources of the plurality of external spare power sources are external to the storage device.