, 39, appeared Wednesday at Bow Street Magistrate's Court in London for an on charges he gained unauthorized access to 97 U.S. government computers, including machines belonging to NASA and the Department of Defense.
The U.S. government alleges McKinnon accessed passwords and deleted critical files from the Earle U.S. naval weapons station, causing the 300 computers in its network to shut down. In the process, he gained password information that could be useful to an enemy and caused the U.S. Army's Washington military district to shut down its systems for about a day, the U.S. authorities say.
Lawyers for the U.S. said McKinnon's attacks cost government agencies about $700,000. The Earle hack, which the U.S. said left the entire network vulnerable to outside access, cost $290,431.
McKinnon, however, said he only, and that he gained unauthorized access to military systems just to look for evidence of UFO conspiracies.
McKinnon's lawyers said he will be fighting the extradition on human rights grounds. If convicted, the north Londoner could face 70 years in jail.
The hearing has been adjourned until Oct. 18 to give McKinnon's defense team more time to prepare its case.
Jo Best of Silicon.com reported from London.