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I have an external HD in NTFS format setup to share from my router.

Here is the fstab entry I have for mounting in Ubuntu:

//rt-n66u-8fe8/data /mnt/rt-n66u-8fe8/data cifs guest,_netdev,uid=matt,gid=matt,rw,dir_mode=0777,file_mode=0666 0 0

All folders have write permissions except for the Music folder:

matt@matt:/mnt/rt-n66u-8fe8/data$ ll
total 4
drwxrwxrwx 1 matt matt    0 Dec 29 12:00 ./
drwxrwxrwx 4 matt matt 4096 Jan 14 14:36 ../
drwxrwxrwx 1 matt matt    0 Jul  6  2015 Audio/
drwxrwxrwx 1 matt matt    0 Aug 25  2014 Courses/
drwxrwxrwx 1 matt matt    0 Dec 29 12:00 documentaries/
drwxrwxrwx 1 matt matt    0 Jul 14  2014 Downloads/
drwxrwxrwx 1 matt matt    0 Dec 29 12:01 movies/
dr-xr-xr-x 1 matt matt    0 Jan 20 11:17 Music/
drwxrwxrwx 1 matt matt    0 Dec 29 12:03 Sports/
drwxrwxrwx 1 matt matt    0 Oct  7  2014 Videos/

Trying to change the permissions gives the following error:

matt@matt:/mnt/rt-n66u-8fe8/data$ chmod 0777 Music/
chmod: changing permissions of ‘Music/’: Permission denied

In fact, I can't change permissions for anything.

If I plug the HD into my computer via USB, I can write to Music/. The problem only occurs through the samba share. What can I do to be able to write to it?

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According to your network location you're running an Asus RT-N66U and looking at the similar firmware screenshot it appears you have R/W configuration available on the router itself, make sure the user you're connecting as has R/W and not just R permission to the music folder share.

  • Thanks. Yes I have checked that and it is set to R/W. Actually I have guest login turned on which defaults everything to R/W. – Matt McCormick Jan 20 '16 at 3:57
  • Hm alright first check for a firmware update this is an old issue then try chmod as root, if that doesn't work check out the ntfs attributes using getfattr -d Music this appears to be a common issue with these routers and ntfs drives so, if it's not too much trouble, formatting to ext3 appears to solve the problem for other users. – JasonSec Jan 20 '16 at 4:26
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Fixed this by:

  1. Plugged external HD into computer so I had write access
  2. Renamed Music to Music2
  3. Created a new Music folder
  4. Copied all the data from Music2 to Music
  5. Deleted Music2
  6. Plugged external HD into router and Music folder was now writeable

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