Ok, I'm new also, but I think i can help.
1) You don't need to unplug the satas - they are just hard drives and if you're booting to the knoppix live-cd then the mandrake on those satas isn't even starting. Basically, nothing in your mandrake setup will affect any knoppix-live cd sessions you do.
2) You need to configure your eth0 device, but not with PPPoE or DSL utiltities. If the verizon DSL modem is always on, and plugged into the hub (or connected to a computer that is plugged into the hub) then you need to set up the IP and DNS for the eth0 adapter. The DSL utilties set up your network card/system to dial using a DSL modem - if the modem is already on/connected and hooked to another PC you don't need to set it up again on this PC. Just set up the eth0 device (network card) wit IP and DNS.
It's been awhile since I've used the knoppix distro, so I don't really remember if there is a GUI LAN config utility in there. If there is, use that to set your IP and DNS and it should
work; but I'm new, too, so you may have to wait for someone more knowledgeable if that doesn't work.
FYI i found it difficult to understand what you were trying to say because you didn't use any punctuation see and i couldn't tell where you started sentences stopped then started and i had to read it a few times to even know where it started and stopped.
;p -- in the future you might get more help if you wrote clearer sentences/paragraphs.