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

Error Message When i connect my External Hard drive

1 Answer 1


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.

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