Hi - got a 2010 mac mini with seagate 1tb external drive running time machine. Upgraded to lion - no problems. Upgraded on 6th feb with mac mini update - restarted and no drive. It appears in disk utility, can't repair it, tried verifying. Drive is clicking and light flashes sometimes. I partitioned it when I got it, media back up on 500gb and time machine on other 500 gb. All photos and music are on there. Drive shows in disk utility, but no where else. Help!