The Washington Post reported:
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The company that managed Hillary Rodham Clinton’s private e-mail server said it has “no knowledge of the server being wiped,” the strongest indication to date that tens of thousands of e-mails that Clinton has said were deleted could be recovered.
Clinton and her advisers have said for months that she deleted her personal correspondence from her time as secretary of state, creating the impression that 31,000 e-mails were gone forever.
There is a distinction between e-mails’ being deleted and a server being wiped. If e-mails are deleted or moved from a server, they appear to no longer exist on the device. But experts say, depending on the condition of the server, underlying data can remain on the device, and the e-mails can often be restored.
To make the information go away permanently, a server must be wiped — a process that includes overwriting the underlying data with gibberish, possibly several times.