0:0 usually means Primary Master
0:1 meand Primary Slave.
1:0 and 1:1 would be Secondary Master and Slave resp.
it does appear as though both drives are on the same channel.
but that doesn't necessarily mean there's only one channel on the motherboard.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien