OSX make two drives appear as continuous volume

I want two drives to appear as one continuous volume on OSX

how would this be done?

they are both connected via sata

ultimately this will be shared over a network from the OSX file server. And even more ideally, this will function as a time machine backup.

1 Answer

Here are Apple's instructions for using Disk Utility to create a RAID set.

Of course, knowing more about your hardware (the computer we are talking about, etc) could improve answers and how specific they get.