The latest revelation in the ongoing effort to find missing White House emails was dropped late Friday: 

Older White House computer hard drives have been destroyed, the White House told a federal court yesterday, and some, but not necessarily all, of the data on those hard drives was moved to new ones.

The White House revealed the information about how it handles its computers in an effort to convince a federal magistrate that it would be fruitless to undertake a plan proposed by the court to recover millions of possibly missing e-mails from 2003 to 2005.

It would be costly and time-consuming for the White House to institute an e-mail retrieval program that entails pulling data off each individual workstation, the White House said in a sworn declaration filed with U.S. Magistrate Judge John Facciola.