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How do I recover files from System Volume Information? 

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This method helps, thanks to DH, to recover information which, otherwise, would be completely lost.
As a result, they cannot recover the compressed files if the first part of the raw compressed data block, which pertains to the header, is damaged or the signature/header block is corrupted.
The result obtained shows that the proposed method is able to perform recovery of files that has been deleted from the file system.
We show that even if the data is encrypted using a key not known by the storage server, the latter can still acquire considerable information about the stored files and even determine which files are stored.
Based on our findings, even a corrupt Btrfs volume could contain remnants of deletion of small files, hidden data in reserved locations and magic string forgery.

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