If the link doesn't work for you log into your account and go to My Verizon Services, TV, My TV, Set Top Boxes, then click on the Learn More button in the "Want More from your FIOS DVR?' ad on the right side of the page.
They then email you with an offer to upgrade each of your DVR boxes for $39.99 to the 500GB boxes which store 75hrs of HD programming and have a much faster processor and are capable of expanding the storage to an external eSATA drive once the new firmware update hits the box. The boxes got shipped overnight and you ship your old boxes back in the same box at no cost to you. My next bill showed two $79.98 (2 boxes) STB Upgrade Charges when it should have shown 1. I called to complain as it should have been one $79.98 charge and the rep on the phone looked at my bill and said we never charge for any set top swap outs and credited my account for both charges. Apparently FIOS has not told their reps about the upgrade fee. Good luck!