TV Recording

[Rob In der Maur]

Hi Cube experts,

I need your advice on the following: I have a Formac Studio DV/TV 
convertor which allows me to watch television on my Cube. I also should 
be able to record TV through this device.
When I'm recording, things start quite ok, but eventually video and 
sound are getting choppy. It seems like the Cube cannot cope with the 
amount of data it has to capture.
I'm using Formac's native application for it as well as a freeware 
application named Vidi. Both application just spit out the incoming TV 
signal to digital video without doing any compression. It means that 5 
minutes of TV approx. generate 1GB of data. It all goes to an external 
LaCie Firewire harddisk of 120MB.
Now I just want get some feeling what is the root of all evil here:
- is it the external firewire disk (should I optimize it one way or 
another or should I use the internal IDE drive for capturing); I also 
have my whole music library on it
- is it OS X which simply cannot handle this
- is it my Cube which cannot handle the troughput on the Firewire port
- is it my processor (500Mhz) and will an upgrade help
- is it something else?

Any advice appreciated.

cheers
Rob