EC-Council Certified Security Specialist (ECSS) Practice Test 2026 - Free EC-Council Exam Practice Questions and Study Guide

Residual data are the traces left on storage media after an action like deletion or erasure, meaning the actual bytes can still exist in places such as unallocated space, slack space, or remnants of deleted files. Because deletion often only marks space as free rather than immediately overwriting it, those bytes can be recovered with forensic tools. That’s why the statement that residual data can be retrieved is the best description. Metadata describes information about a file, not residual traces of the data itself; archival data being not commonly used isn’t a defining trait of residual data, and transient data refers to data in memory, not the persistent remnants on storage media.