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Founded in 1935, TDK has its origin in magnetic materials, being the first company to commercialize ferrite in the world, and it used to be known as one of the major cassette-tape manufacturers. TDK is now the only external supplier for magnetic recording heads for HDD, and it intends to expand its magnetic sensor business for handsets and automobiles by leveraging its expertise. It is also a global top supplier of passive components for autos and polymer rechargeable batteries.