Add Drive to TCD 649080

[TxPres]

I have a TiVo TCD 649080 that I would like to increase capacity. In the Hinsdale Instructions it says my unit can only have 1 drive. A second drive can't be added.
However when I go through the interactive process to see what I can purchase to upgrade, it shows I can purchase a second add-on drive to increase capacity.
Which is correct?

[WK-Jason]

Sounds like an incorrect statement to me. You can absolutely add a second drive to the TCD64x models.