External Hard Drive for use on PC and Mac

I just purchased a SimpleTech external USB harddrive. I can copy files from both PC and MAC to it.
However,
--files transferred from PC are not visible to the MAC.
--Files transferred from the MAC are visible by the PC, but when changed on PC the changes can't be seen on the MAC.
I contacted the company and they have no idea. Any thoughts??

You can't write to it because it's formatted as NTFS which OS X will read but not write to. If you want to continue using the drive with both a PC and OS X you will need to download and install NTFS-3G so you can then write to it from your Mac. You can get NTFS-3G at:
http://www.macupdate.com/app/mac/24481/ntfs-3g
If you want to use the drive exclusively with your Mac then move the data off it and reformat it in Disk Utility (Applications - Utilities - Disk Utilities) as Mac OS Extended (Journaled.)

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