Use a hard disk 320GB or larger to buffer print jobs collate large jobs or to store forms fonts or macros. These key functions are enabled when an optional hard disk is installed Job Building Printer lockout storage used by Application Solutions such as FormsMerge Job Buffering print spooling email spooling font and macro storage User-based billing Job Park through a power-off and power-on cycle hard disk-related administration Disk wiping Disk encryption Disk diagnostics. The Disk Encryption function provides a randomly generated encryption key used to encrypt all data stored on the hard disk. This key generated by each printer is unique to that specific printer.