There will be an LBA48 file in the 5035 archive that explains the settings. By default the 5035 BIOS is set to F gets rest, i.e. F gets all space after about the 8GB mark. You'll probably need to reformat to see the changes, I'm not sure. On my 160GB Seagate this is the case. Boils down to about 145-150GB once the byte -> kilobyte -> megabyte -> gigabyte math and filesystem overhead are applied. I haven't seen anywhere and no one has yet provided me with the absolute limits of the LBA48 partitioning, but for some reason the figure of 2TB sticks in my head. Anyone have the facts here? And like dsscrusher mentioned, be sure you put on the right BIOS version for your box. The file names identify which is which.
Also, be sure to back up your data before playing around with your parititions, if you've got anything of value on there.
-Whoopin'