[ubuntu] Ubuntu file search noob question

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http://ubuntuforums.org – I have been using Ubuntu for some time now, but never really had the need to search for a specific file until recently. I used nautilus browser set to 'file system' to attempt to search the entire drive. The search lasted a second and turned up zero results. I am guessing that it only searched the names of the 21 main folders (bin, boot, cdrom, dev etc.) and three files with shaded-out names and did not actually search the entire drive including subfolders, files etc. So I selected all of the 24 files and folders in the nautilus window and then searched, and that worked: the search took so (Hardware)