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

[kasse]

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?

 

[chemisttree]

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