I am adding a second HD to my Compaq Presario 5000T desktop so I
can back up the original HD. I'll have some room left over for
Linux, if it will run on this machine. Anyone successfully done
so? Which distribution?

If so, to boot from Linux I assume the Linux partition must be
first on the added HD? Can the HD be set as a slave?

I tried an unsuccessful Google search for this info.