I recently read an article about the effectiveness of some security softwares which claim to be able to erase personal data in the hard disk and nobody could recover it. While I don't think many fraudsters have the resources, as the authors in the university, to acquire those expensive forensic tools to prove the claims are not true and easily collect privacy data in disposed hard disks, but it does reveal that as an ordinary computer user, we don't know how casually the operating software or other programs are handling our personal information. Scott didn't discuss about "how" because it is not easy.

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