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Laboratory demonstrations using spin torque oscillators to generate microwave fields within the write gap of a magnetic recording head have shown that microwaves can excite the magnetic materials.

This is a small additional boost over that achieved by SMR HDDs but it appears to be achievable with relatively minor changes in the magnetic recording head and media. 

The patent alleges infringement of patent 7,097,286, “Ink jet recording head structure, ink jet printer, powder molding method, method of manufacturing recording head structure supporting member, and powder molding press apparatus.”

The arm holds a recording head the size of a pepper flake, which sits above the disk at a height measured in nanometers—less than the ridges of a fingerprint, as marketers like to say.

Changing tapes was only a matter of slapping a new reel into place, dropping the tape into the recording head, and threading it into the empty reel.