On my computer with dual systems(win7+centos6.4(now 6.5), after I do something, problems came out: when I plug portable hard disk into my computer, It is not mounted successfully. SO I do as the suggestions from URL 'http://wiki.centos.org/TipsAndTricks/NTFS' with the following block: _/Installing required packages/_ _//__//__//__//_ _/For /__/*CentOS-6*/__/the /__/*EPEL*/__/repository is carrying later NTFS packages. EPEL is also usable for /__/*CentOS-5*/__/. To install, after enabling the repo per the /__/Repositories <http://wiki.centos.org/Repositories>/__/page: /__//_ _/yum install ntfs-3g /__//_ _//_ _/or if you prefer to leave EPEL disabled by default /__//_ _/yum --enablerepo epel install ntfs-3g /__//_ _//__//_ _/You may also want to /__//_ _/yum install ntfsprogs ntfsprogs-gnomevfs /__//_ _//_ _/for additional functionality. /__//__//_ _/Mounting an NTFS filesystem/_ _//__//_ _/Suppose your ntfs filesystem is /__//dev/sda1/__/and you are going to mount it on /__//mymnt/win/__/, /__//__/do the following. /__//__//_ _/First, create a mount point. /__//_ _/mkdir /mymnt/win /__//_ _//_ _/Next, /__/*edit*/__//__//etc/fstab/__/as follows. To mount read-only: /__//_ _//dev/sda1 /mymnt/win ntfs-3g ro,umask=0222,defaults 0 0 /__//_ _//_ _/To mount read-write: /__//_ _//dev/sda1 /mymnt/win ntfs-3g rw,umask=0000,defaults 0 0 /__//_ _//_ _/You can now mount it by running: /__//_ _/mount /mymnt/win/_ But after doing that, the error is also reported "Unable to mount location\Error mounting: mount:unknown filesystem type 'ntfs'". So I /*mkdir*/ another */mnt/win*, */delete/* the */mymnt/win* and try again. the error is reported too! At the same time, when I reboot the computer. I can not login the Win7 system by error reported " *BOOTMGR is missing*" How can I fix these problem? By the way I use 'fdisk -l' to check my partition and shows as follows: /Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x1cc5999d Device Boot Start End Blocks Id System /dev/sda1 * 1 26 204800 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 26 12927 103628800 7 HPFS/NTFS /dev/sda3 12927 117676 841393152 f W95 Ext'd (LBA) /dev/sda4 117676 121602 31534808 12 Compaq diagnostics /dev/sda5 12927 44798 256000000 7 HPFS/NTFS /dev/sda6 44798 76669 256000000 7 HPFS/NTFS /dev/sda7 76669 103440 215040000 7 HPFS/NTFS /dev/sda8 103440 103466 204800 83 Linux /dev/sda9 103466 110477 56320000 83 Linux /dev/sda10 110477 111497 8192000 82 Linux swap / Solaris /dev/sda11 111497 117676 49629184 83 Linux// //Can you help me out?/ best regards, yours alex