A keyword in the analyser disk format description language. It is better known as a checksum, but is named as such to be in line with Trace terminology. A checksum is generated for a selected area of data, and stored at a defined location on the media. These checksums can be nested and/or overlapped; the analyser resolves the dependencies and thus the correct order of calculating the values. Due to various shortcuts in their code, some EDC‘s seem like they were originally performed on raw data but in reality they worked with unencoded data in most cases.