Patent ID: 8423729

Claim:
A part information restoration method adapted to an electronic apparatus which comprises first and second parts which are replaceable and are provided with a nonvolatile memory configured to store part information unique to each respective part, comprising: storing part information unique to the first part in a first nonvolatile memory of the first part, and saving part information unique to the second part as first reference information in the first nonvolatile memory of the first part at least when replacing the second part; storing the part information unique to the second part in a second nonvolatile memory of the second part, and saving the part information unique to the first part as second reference information in the second nonvolatile memory of the second part at least when replacing the first part; and restoring the first reference information in the second nonvolatile memory or restoring the second reference information in the first nonvolatile memory, after replacing the first or second part, based on a comparison result of the first reference information stored in the first nonvolatile memory and the part information unique to the second part stored in the second nonvolatile memory and a comparison result of the second reference information stored in the second nonvolatile memory and the part information unique to the first part stored in the first nonvolatile memory.