What is the fine-grained topic of the following text: While some companies simply run tape cartridges through a degausser, rewrite portions of a tape, or wipe out the header track and call the data in question “erased,” World Data Products uses industry-leading erasure practices to ensure total data eradication and provides a final archive document that details the date, location, and eradication procedure for each Volser number. Only return the topic.
World Data Products' data eradication practices