Q: Why doesn’t ODIN recognize my USB disk?
USB disks with capacities greater than 32 GB must be in NTFS format to be recognized by ODIN. If you need to reformat your USB disk follow these instructions for your specific computer OS. Keep in mind that reformatting your disk will cause the contents to be ERASED. Back up your disk before doing so.
Windows: Microsoft's guide: http://windows.microsoft.com/en-us/windows/convert-hard-disk-partition-ntfs-format.
OS X: As NTFS is a Microsoft developed file system, you will need additional paid software for your Mac to reformat your disk. Both Paragon's NTFS for Mac: http://www.paragon-software.com/home/ntfs-mac, or Tuxera NTFS for Mac: http://www.tuxera.com/products/tuxera-ntfs-for-mac will do this for you.
Linux: As NTFS is a Microsoft developed file system, you will need additional software for your Linux build to reformat your disk. Paragon's NTFS&HFS for Linux Express: http://www.paragon-software.com/home/ntfs-linux-per, will do this for you.