Definitions for "SCRATCH DISK"
A hard disk used by a program such as Adobe Photoshop to store temporary (or "scratch") files while the program is being used. Image editing programs are often used to edit very large graphics files--files much too big to fit in the computer's memory. A scratch disk is used to store temporary copies of the image while it is being edited. Many programs require a great deal of free space on their scratch disks; image editing programs, for example, may want free space equal to five times the size of the file being worked on.
Portion of existing hard disk space reserved by an application for use as temporary working space.
The disk or disk space you allocate in Final Cut Pro for digital video capture and editing.