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When I try to make a new directory on my external hard-drive I get a message saying that it is a "Read-only file system"

LU06296APPLE:~ fortinok$ mkdir /Volumes/Seagate\ Backup\ Plus\ Drive/working_files
mkdir: /Volumes/Seagate Backup Plus Drive/working_files: Read-only file system

However, it looks like from the permissions, that the owner of the drive should be able to "write"

drwxrwxrwt@  5 root      admin                    170 Feb 16 09:02 .
drwxr-xr-x  34 root      wheel                   1224 Feb 13 16:00 ..
lrwxr-xr-x   1 root      admin                      1 Feb  2 08:28 Macintosh HD -> /
drwxr-xr-x   1 fortinok  LONGWOOD\Domain Users   4096 Feb 15 22:34 Seagate Backup Plus Drive

Since I am the logged in user:

LU06296APPLE:~ fortinok$ who
fortinok console  Feb  2 08:58 
fortinok ttys000  Feb 13 07:55 

and I "own" the drive, why can I not make a new directory?

(Note: I am also unable to make a new directory using Finder.)

  • 3
    What format? NTFS? – Tetsujin Feb 16 '15 at 16:28
  • 2
    Is that disk formated in NTFS ? – Matthieu Riegler Feb 16 '15 at 16:28
  • The whole drive is mounted read-only, so the individual permissions are not important. Can you eject the drive (in Finder) and then turn it off/on again so it gets mounted again? – nohillside Feb 16 '15 at 16:29
  • @Tetsujin how can I determine if it is NTSF? – KennyPeanuts Feb 16 '15 at 16:33
  • Get Info on the drive itself. Near the top, General > created:x Modified:x Format:... – Tetsujin Feb 16 '15 at 16:35

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