Have you tried to partition and add a file system to the Sata drive? You won't be able to mount it until you have.
Do you have a /dev/sda ???
It would also help a lot if you stated your distro, there are different utilities depending on the distro for partitioning and formating. Mandrake has a gui tool, and is brain dead simple to use. Others use command line only.
Once you have it partitioned and foramtted, then you use the mount command.