The recordings are tied to the original Tivo Service Number and you must run Clear & Delete Everything to be able to record. In the System Information screen, you most likely will see all ZEROS in your Tivo Service Number.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!