There is no way to convert. You will need another spare disk to copy. But on any linux system, avoid ntfs. The driver written on linux was actually reverse engineered and has extremely poor performance because it runs in user space. There is a newer driver written by paragon, but I think it is still not there in mainline.Let me try that.. Any utils to convert file system keep the data ?
Paragon NTFS driver might finally make it into Linux
Working with Windows' NTFS drives in Linux has always been difficult, but if the Paragon NTFS driver finally makes it into the Linux kernel, it will be much easier.
www.zdnet.com
Also an official driver for exfat might make it into the linux kernel. But the current driver also works fine and is quite fast.
ExFAT is on its way to the Linux kernel
There are many technical problems to be solved before this popular, formerly proprietary file system can be in the shipping open-source Linux code.
www.zdnet.com