Storage device for maintaining prefetch data, electronic device including the same, and operating method thereof

A host device for controlling a storage device, the host device comprising:

• a host buffer configured to store map data representing a relationship between a logical address of data stored in the storage device and a physical address corresponding to a position in a nonvolatile memory device of the storage device in which the data is stored, the map data being provided from the storage device;
• and
• a storage device controller configured to:
• transmit, to the storage device, as prefetch data, map data about at least two logical addresses among the map data stored in the host buffer,
• transmit, to the storage device, a multi-chunk read command which is a read request for data having the at least two logical addresses, and
• receive, from the storage device, a response message including information representing whether the storage device has processed the multi-chunk read command to read the data by using the prefetch data and stored in a volatile memory device of the storage device or without using the prefetch data.

A computing system comprising:

• a host device;
• and
• a storage device configured to:
• receive, from the host device, mapping information for data to be read as prefetch data,
• temporarily store the mapping information,
• receive, from the host device, a read request for the data,
• process the read request by using the mapping information, and
• maintain the mapping information therein after data corresponding to the read request is read by using the prefetch data,
• wherein the mapping information includes a relationship between a physical address of the storage device, in which the data having a logical address is stored, and the logical address.

A storage device comprising:

• a nonvolatile memory device;
• a map data storage configured to temporarily store a part of map data representing a relationship between a logical address of data, provided from a host device, and a physical address corresponding to a position in the nonvolatile memory device in which the data provided from the host device is stored;
• a prefetch data storage configured to store, as prefetch data, map data received from the host device;
• and
• a memory controller configured to control the nonvolatile memory device and the prefetch data storage to:
• process a multi-chunk read command as a read request for at least two logic addresses received from the host device by using the prefetch data, and
• maintain the prefetch data in the prefetch data storage after data corresponding to the at least two logic addresses is read by using the prefetch data in the prefetch data storage,
• wherein the map data includes a relationship between physical addresses of the nonvolatile memory device, in which data having the at least two logical addresses is stored, and the at least two logical addresses.