[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/05/20/art.bill0520.gi.jpg caption="A hard drive containing Clinton administration records is missing from the National Archives in Washington."]
WASHINGTON (CNN) –The National Archives - a repository of important government documents, including the U.S. Constitution - has lost a computer hard drive containing large volumes of Clinton administration records, include the names, phone numbers and Social Security numbers of White House staff members and visitors.

Officials at the Archives say they don't know how many confidential records are on the hard drive. But congressional aides briefed on the matter say it contains "more then 100,000" Social Security numbers, including one belonging to a daughter of then-Vice President Al Gore. It also contains Secret Service and White House operating procedures, the staffers said they were told.

The hard drive was last seen in the National Archive's complex in College Park, Md., sometime between October of last year and the first week of February. It was discovered missing in late March, prompting a thorough search for the small, 2.5 pound device, the Archives said.When it could not be located, the inspector general's office opened a criminal investigation.

On Wednesday, the Archives announced a $50,000 reward for information leading to its return.

The Archives said that no national security information is on the hard drive, nor any original documents. But they said it does contain "personally identifiable information," and they take the loss "very seriously."

U.S. Rep. Darrell Issa, R-California, whose staff was briefed on the matter, said the House will hold a hearing Thursday on the incident.
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