Scratch Disks Tab
You use the Scratch Disks tab to choose where you want to save captured video and
audio media files and where to store the render, cache, and autosave files that
Final Cut Pro creates. You can also specify other settings related to the size of captured
and exported files and the minimum available space allowed on scratch disks. You can
specify a maximum of 12 scratch disks. For more information about scratch disks, see
Volume 1, Chapter 11, “Connecting DV Video Equipment.”