The Library of Congress is exploring the feasibility of using ultra-high density optical data storage for long-term preservation of a subset of its digital collections, which currently exceed 33 petabytes. The solution must exhibit high areal density, a long lifespan, reduced maintenance, immutability, and durability. The focus is on encoding various data formats—including video, audio, text, and images—with error detection and high-fidelity recall. This is a Request for Information only, not a solicitation, and no budget amounts or performance location are specified. No submission timelines are provided, as this is an informational RFI.