If you mean by attaching the MED500X by USB I guess that you need an NTFS driver for your MAC such as any of the ones,
NTFS for MacŪ OS X by Paragon (
http://www.paragon-software.com/home/ntfs-mac/)
Tuxera NTFS for MAC (
http://www.tuxera.com/products/tuxera-ntfs-for-mac/)
Mediafour MacDrive (
http://www.mediafour.com/products/macdrive)
all cost $$
I even believe that there is an native Apple Bootcamp NTFS driver available if you Google some you should be able to find it.
There is also an utility, NTFS Mounter, (
http://ntfsmounter.com) that enables the native capabilities to read/write NTFS..
The MED500X has over-the-network access that you might try also