I can't write to a external disk in my MacBook Air

Hi, I have a (Samsung M3 Station External Hard drive (1.5T) ) and i want to use it  in my MacBook Air, but i'm having some problems with it. The MACBook Air recognizes de disk and I can read the information but is impossible to copy or  write  any information on this disk. 
Is there any chance to use an external drive whith MAC computers?

Your external disk is probably formatted with the NTFS file system (Windows).
OS X can't write to the NTFS file system.
If the external disk will only be used with your MBA save any data you don't want to lose and use Disk Utility to re-format it with an OS X supported file system.
If it needs to work with both OS X and Windows machines then FAT32 or exFAT are the only compatible file systems.
There is third party software available that will allow OS X to write to an NTFS file system but I have no experience with that so don't know how well it works.

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