Usually is not possible to write on a NTFS filesystem, this is the reason of a read-only mounted drive! A chance would be to install the package ntfs-3g
which will let you write on NTFS. It is still in a beta testing stage, but sincerely I haven't had any problem till now!
PS - Please, fill the "Distribution" field on your Profile edit: the knowledge of the system you're running will help the LQ community to give a more suitable answer to your questions! Cheers