Disc image of a CD or DVD; recognized by Windows as an actual disc, even though the data is on the hard drive; allows CDs and DVDs to be used without requiring physical drives; useful for mounting discs on network computers.

Data dump generated by logic simulation programs and saved in a text format; contains header information, variable definitions, and value changes for specified variables; value changes are given in scalar or vector format, based on the type of variable.

Copy of a CD or unprotected DVD saved as a compressed image, or virtual disc; can be run in place of the original disc in any one of up to 23 virtual drives.