I've got these on my MP3 player - HDD (and on mounted Windows - networked drives). The folders have little padlocks in the corner, and are locked under 'get info'. Why can't I do anything to the files on my USB HDD? (Some files and folders are fine, while others aren't). I've tried in Terminal: "sudo rm file" but I get operation not permitted. I can't 'untick' the locked box in get info either. These folders were created using Windows, and the drive is MS-DOS (FAT32) not NTFS Does anybody have any idea on how to unlock these folders, or to delete their contents?