Can I add an eSATA drive to upgraded TiVos purchased from Weaknees, DVRUpgrade, and other third parties?
As per the previous FAQ, the new “plug and play” eSATA expansion support does not work on any upgraded TiVo. That includes all upgraded TiVos sold by Weaknees and DVRUpgrade. It does not matter who does the upgrade. You can still add an eSATA drive to an upgraded TiVo, but doing so requires you to open the box and void the warranty. Instructions to do that can be found in Section IV, #10 of this FAQ.