Você pode ler as Diretrizes para sanitização de mídia (PDF) do Instituto Nacional de Padrões e Tecnologia .
Reel and Cassette Format Magnetic Tapes
Clear magnetic tapes by either re-recording (overwriting) or degaussing. Clearing a magnetic tape by re-recording (overwriting) may be impractical for most applications since the process occupies the tape transport for excessive time periods. Clearing by Overwriting: Overwriting should be performed on a system similar to the one that originally recorded the data. For example, overwrite previously recorded classified or sensitive VHS format video signals on a comparable VHS format recorder. All portions of the magnetic tape should be overwritten one time with known non-sensitive signals.
Degauss using an NSA/CSS-approved degausser. Purging by Degaussing: Purge the magnetic tape in any degausser that can purge the signal enough to prohibit playback of the previous known signal. Purging by degaussing can be accomplished easier by using an NSA/CSS-approved degausser for the magnetic tape.
- Incinerate by burning the tapes in a licensed incinerator
- Shred
Preparatory steps, such as removing the tape from the reel or cassette prior to destruction, are unnecessary. However, segregation of components (tape and reels or cassettes) may be necessary to comply with the requirements of a destruction facility or for recycling measures.