NTFS (New Technology File System) is the default file system used on recent Windows versions and the Windows system disk is based on the NTFS format.
Linux has offered full read support for NTFS file systems for a long time. However, the NTFS write support that comes with the kernel is still missing. If you want a full read-write support for NTFS disks, you will have to use ntfs-3g (Ntfs third generation driver), that is a userspace program.
If you just want a read support on NTFS disks, you just have to mount it with the following command (you have to replace xxx with the device name of your disk):
mkdir -p /mnt/windows mount -o ro -t ntfs /dev/xxx /mnt/windows
This read-only support is safe (you cannot alter or damage your data) and may be used for example if you just want to backup several files, or read a document.
If you need a complete NTFS Write support, you will have to use ntfs-3g instead:
mkdir -p /mnt/windows ntfs-3g /dev/sda1 /mnt/windows
In this example, we suppose the device name of the NTFS partition is
and the mount point is
/mnt/windows. If you do not know the device name, you
blkid or GParted to identify the disk.