I have a Western Digital Elements 1TB External USB drive and am unable to format 1 partition as Mac OS Extended (or Journaled for that matter) in Disk Utility. I can format the drive as FAT32 with no issue, and I can format the drive as FAT32 with 1 NTFS partition with no issue. But any time I try to format the partition as Mac OS Extended or Mac OS Extended Journaled it reports an underlying error and stops. I can't figure it out. I don't know what the problem is or what to look for. Does anyone have any pointers?