As far as I know, no such thing exists, but I would think it would be a great idea to have a "sister site" to the NES Cart Database focusing on Famicom Disk System software.
Most Famicom Disks have a logical, if rudimentary file system. FDS Explorer is a program that can show you the file structure. However, the issue becomes "how do we know that this is a good dump?"
A checksum of the whole image should work to distinguish a pristine dump if the game does not use saving features or the disk has been dumped from a sealed package. However, not all games have had pristine dumps and sealed disks are getting harder and harder to find. Even with a sealed disk, the data may have failed after 20-25 years. I would suggest instead that the focus be on "working dumps." These dumps may have save data on them, but will work as well as a genuine disk in a real FDS. This requires making checksums or hashes of the files on the disk according to the official layout. It also requires identifying, on a game by game basis, the save file or files for every game which saves to disk.
I believe that Nintendo has helped us out with the latter. Nintendo included a copy protection chip in its later disk drives called the FD3206P. This chip restricts the drive to rewriting a single file on the disk. If my information is correct, only the last official file on the disk can be overwritten. Although it came later in the Disk System' life, older games should only be using one file for saving, otherwise they would be incompatible with newer drives. In that case, it should be easy to determine the save file.
Statistics: Posted by Great Hierophant — Tue Jun 16, 2015 2:21 pm