Additionally, some user data can be unreachable by erasure programs, such as drive data blocks removed from use due to excessive errors. Other special programs are available to more definitely erase user data, such as Norton WipeInfo, which offers a "Government Wipe." Because these are special programs, they are not widely known or used. Even if users delete their files, they can be recovered from "recycling" folders or by special programs such as Norton Unerase. Consequently, user data often remains stored on disk drives when they are discarded, transferred to another user, or returned off lease. All this implies that true file erasure is an abnormal situation. Drives use elaborate error detection and correction techniques to never return incorrect user data. This includes protection against accidental erasure, using "recycle" folders and unerase commands. Introduction A cardinal rule of computer data storage devices is to protect user data at all costs.
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