Are there already implementations for a file system?

[BigBang]

Are there already implementations for a file system?

Is a third part planned for nand2tetris?

Or can anyone recommend a course that builds on nand2tetris and enables the implementation of advanced concepts such as file systems etc.?

[Teledar]

See this post:
http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/File-class-for-VMEmulator-td4028538.html