Can those Tivo HD users with M-cards please provide the model number or part number for the M-card? If there is a SKU or other code on their installation receipt that would also be helpful. This will aid those of us getting installations and talking to cable company CSRs who aren't familiar with M-cards. The cards might be in the system and they don't know how to locate them. Knowing the model number, part number, SKU, etc, might help us have them look up the part and we get the right card installed the first time.