Oh the carbus is long (and costly) story
I have a Compaq Presario 2145CA. I bought a SIIG USB 2.0 + Firewire cardbus. And I never managed to get these two to work with the burner. I tried all sorts of things (too long a list to mention here

). But anyway, according to SIIG support, the only way the cardbus was going to work was if I disabled Power management from the BIOS. And some brilliant mind in Compaq decided that their notebooks shouldn't have such "Advanced" settings for lay people to tweak around with

. So, the laptop has very very limited functions in the BIOS, which do not inclide disabling Power management. SO I had to return the card. Now I don't want to take any further risks by investing in other cardbuses.
I do have a 4-pin firewire port on my lappie, so I decided instead to go in for an External FireWire enclosure instead. And hence this thread
Thanks,
Adarsh