Dont know if this has been posted before , but this is "Jay-Z 1989-1994 Early Tapes" . Some real good stuff there , enjoy.
http://rapidshare.com/files/12885866/JAY-Z_-_Underground__1989-1994_.rar.html
http://rapidshare.com/files/12885866/JAY-Z_-_Underground__1989-1994_.rar.html