This isn't really the tool for that. With FatFS, you provide a way to interact with the storage medium (disk read/write and so forth) and FatFS handles everythi

This isn't really the tool for that. With FatFS, you provide a way to interact with the storage medium (disk read/write and so forth) and FatFS handles everything at the filesystem level (file open, directory listing, etc.) It would be much easier to emulate a filesystem (perhaps even copying parts of FatFS' API) than it would be to emulate a virtual disk and and access it at arm's length with FatFS.