Here are some useful link which i used to get my external harddisk mounted to to the systems for backing data up.
CentOs - http://wiki.centos.org/TipsAndTricks/NTFSPartitions
yum install fuse fuse-ntfs-3g dkms dkms-fuse
Install NTFS driver for Fedora
With repositories like Fedora Extras it’s now very easy to add NTFS support to Fedora:
# yum -y install ntfs-3g
Then you can simply mount NTFS file systems using the option -t ntfs-3g. You can find more detailed information about this driver at http://www.ntfs-3g.org/