http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MediumFormatCode cpio 001 cpio tar 002 tar highSierra 003 highSierra iso9660 004 iso9660 iso9660RockRidge 005 iso9660RockRidge iso9660AppleHFS 006 iso9660AppleHFS iso9660AppleHFS 006 iso9660AppleHFS