Patent ID: 6393561
Filing Date: 2002-05-21
Classification: G06F

Abstract:
A disk drive for reading information from a disk and outputting the read information which is to be provided to a host, comprising:an accessing circuit which accesses the disk and generates the read information from the disk; an interface circuit which transfers the generated read information from the accessing circuit to the host; and a microcomputer, coupled with the accessing circuit and with the interface circuit, including a central processing unit and an electrically erasable and programmable nonvolatile memory, wherein the electrically erasable and programmable nonvolatile memory stores a first program, a second program and a third program, wherein using the stored first program, the microcomputer controls the accessing circuit so that the operation of the accessing circuit is controlled by the stored first program, wherein using the stored second program, the central processing unit is adapted to detect whether or not a specific command is provided to the interface circuit from the host, the specific command enables a rewrite operation of the contents of the first program in the electrically erasable and programmable nonvolatile memory by the microcomputer, and wherein using the stored third program, in response to the specific command detected by the central processing unit, the microcomputer is adapted to transfer data for rewriting the contents of the first program in the electrically erasable and programmable nonvolatile memory from the host to the electrically erasable and programmable nonvolatile memory via the interface circuit.