Dell 5110cn User Guide - Page 146

To allocate memory to the RAM Disk file system for the Secure Print and Proof Print features. The change becomes effective after the printer is turned off and then on again. Values: Allocates memory to the RAM Disk file system automatically. Enable* Does not allocate memory to the RAM Disk file system. Secure Print and Proof Print jobs will Disable abort and be recorded to the job log. NOTE: The RAM Disk menu is only displayed when 256 MB or more of optional memory card is installed on the printer. NOTE: Restart your printer when you change the setting for the RAM Disk menu. Substitute Tray Purpose: Specifies whether or not to use another size paper when the paper that is loaded in the specified tray does not match the paper size settings for the current job. Values: Off* No tray size substitute accepted. Substitutes paper of next largest size. When there is no larger paper size, the printer Larger Size substitutes paper of nearest size. Nearest Size Substitutes paper of nearest size. Substitutes paper from the multipurpose feeder. MPF Feed mm/inch Purpose: Switches measurements between millimeters and inches. Values: