How to add more HD space to Comast duel VTR stb's ??

[Voomster]

Howdy ....

I recentely upgrded to (two) Motorola / Comcast duel tuner/ vtr units
which each units allows 15 hours of HD recorded content I am very happy with the quality and software features and having two boxes gives me 30 hours of HD recorded content , and that's just not enough for me

With all of the firewire / usb 2.0 and ethernet conncection on the back of the box had anyone discovered a way to added more gigabytes of HD hard disk space to those Motorola stb's ????

There has got to be a way

Comcast is vastly improving by the month :

But Comcast will Never replace Voom as it was

I remain,
The Voomster bow