A system manages the allocation and storage of media content instance files in a hard disk of a storage device of a media client device in a subscriber television system. In one embodiment among others, the system includes a memory for storing logic, a buffer space in the hard disk for buffering media content instances as buffered media content instance files, and a processor configured with the logic to track the size of permanent media content instance files and the buffered media content instance files to provide an indication of available free space, such that the indication is independent of the buffer space.