How Does S-Layer Protein-Based Data Storage Compare to Traditional Hard Disks?

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S-layer protein-based data storage utilizes proteins that are 3nm in diameter to position magnetic particles, potentially allowing for high-density data storage. The discussion raises questions about the correct measurement for protein density, whether per mm3 or mm2, and the thickness of the membrane is also a consideration. Current hard disk technology achieves data storage densities of 100 to 200 Gbit/in², prompting a conversion to bits/nm for comparison. This highlights the potential advantages of protein-based storage in terms of density and efficiency. Overall, the conversation emphasizes the need for precise calculations to evaluate the feasibility of S-layer protein storage against traditional hard disks.
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An S-layer protein is 3nm is diameter. Calculate number of proteins per mm3 of membrane. If the
protein is used to pattern a surface used for data storage - each protein molecule can position one
magnetic particle (1bit) compare this type of storage with current hard disks.

Just one question before I start calculating: Is it correct with "proteins per mm3 of membrane", or is it supposed to be "per mm2 of membrane", you think?
 
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How thick is the membrane? If the spherical (?) proteins are packed in the membrane edge-to-edge, you are looking at dots of 3 nm diameter.

Current disk technology can store data at about 100 to 200 Gbit/in^2. Convert 200 Gbits/in^2 to bits/nm
 
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