A “normal” data deletion does not guarantee sufficient protection against unauthorized access to the supposedly deleted data. Such a process merely removes the allocation reference from the table of contents of a data carrier and sets an attribute on the data that is no longer required, which allows future data overwriting. However, all deleted data is still there. It is therefore possible with the simplest methods to read out and restore deleted data.

Normal & easy deletion

Even after a hard drive has been formatted, the data previously stored on it can be restored at any time. Even performing a low-level format does not perform secure data erasure or destruction.

Secure data erasure

Complete, secure data erasure – which cannot be restored – is only guaranteed if a data medium has been overwritten several times. The overwriting is usually done using different bit patterns. Various methods of data deletion are currently considered safe.

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