NTFS External drive issue in Mac 10.9 Earlier i was able to access the NTFS formatted External hard drive in my Mac 10.9 as read only device.

While trying to make the external NTFS drive writable i screwed up by unmouting it

this link


  diskutil unmount /dev/disk1s1


Later when i tried mounting it again it failed


  diskutil mount
  Volume on disk1s1 failed to mount
Following the unmount you should also eject the disc before unplugging it.

diskutil unmount /dev/disk1s2    
diskutil eject /dev/disk1s2


Alternatively you could use the usual methods: eject via finder, via dragging the drive icon into the waste bin, or with third-party apps like Alfred or Launchbar.