Newbie Question Regarding SATA Network Adapters

I am just getting into this as a new project. Considering attempting to install a 2tb sata drive into the ps2. My question is in regards to the ps2 network adapter. I see every guide saying you need either the network adapter or I see a lot of people use the gamestar sata adapter. What exactly is the adapter for? Is it possible to run the harddrive without using the sata adapter? Curious if I am running off a sata adapter, do I always need this network adapter attached to the ps2?

My...

Newbie Question Regarding SATA Network Adapters