you can use one partition
check this link
http://wdc.custhelp.com/app/answers/detail/a_id/291/session/L3RpbWUvMTM1NDU3MjE2Ni9zaWQvdEpFeXlSY2w%3D
or you can leave it as is and use this app on Mac
Catacombae - HFSExplorer