I have an external hard drive, which already has a bootable partition for a Snow Leopard installation disk, and a bootable partition for Mavericks, both created with Mac OS X and working fine in Windows and Mac.
I want to create one NTFS partition and one FAT32 partition on this external hard as well but cannot.
If I create it in GUID, for the sum of sizes of FAT32 and NTFS partition I get one unallocated partition in Windows. If I do it in Windows, it shows on the Mac but the content are not there.
Inspecting the hard in a partitioning tool in Windows shows that there is a 200MB hidden partition on the hard drive as well (type: primary), so I guess the problem is with the maximum 4 primary partitions limitation of MBR.