no permissions to external hard drive Maxtor OneTouche II
If the filesystem of the partition is NTFS, the normal way is to mount the partition as read-only so it's not possible to write.
If you want to do it, you have to umount the disk and remount it with ntfs write permissions. This may give some filesystem corruption.
In my opinion on don't recommand the write on NTFS partition howerver some do it with no worries.