Analysis of information sources in references of the Wikipedia article "Trash (computing)" in English language version.
When Microsoft Undelete is using the Delete Sentry level of protection, files that are deleted are stored in a hidden SENTRY directory in the root of the drive.
Delete Sentry. This is the most reliable file-recovery method. This method sets up a hidden directory named SENTRY. UNDELETE saves the contents of all deleted files in this directory. Because these files are kept in the hidden directory, it doesn't matter whether the originals have been written over or not. UNDELETE simply restores the files you want from the SENTRY directory.
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