| Media type | Memory card |
|---|---|
| Capacity | Variable |
| Developed by | Constellation 3D |
| Usage | 3D optical data storage |
| Extended from | Fluorescent Multilayer Disc |
| Extended to | Digital Multilayer Disk |
The Fluorescent Multilayer Card (FMC) is a hypothetical memory card technology that applies the same 3D optical data storage mechanism as the Fluorescent Multilayer Disc. The concept was developed by Constellation 3D.
An FMC has a square, transparent window with multiple layers beneath it. Each layer is made of a different fluorescent material that emits light; each layer emits light of a different color (wavelength). An FMC reader could distinguish one layer from another by the wavelength, and therefore read from them without the problems that limit the number of layers in a DVD.
Constellation 3D estimated that a card with a data area of 25 millimetres (0.98 in) could hold 10 gigabytes of data.