Can't write on external HDD after upgrading to OS X El Capitan I am using a LaCie external hard disk in my MacBookPro for 3 years. After having updated to OS X El Capitan, I am no longer able to write on the HDD and I have read-only privileges. Info shows that the HDD is formatted in NTFS but, before upgrading, I was able to both read and write on the hard disk without any problem and without any external app.
Any suggestions to solve this issue?

[Update]: I have installed Tuxera NTFS and now everything works fine. Before I had other applications that are no longer valid for El Capitan.
You have to install Tuxera NTFS or Paragon NTFS, OS X is not able to write on NTFS.

http://www.tuxera.com

https://www.paragon-software.com/home/ntfs-mac/

Edit :

A free solution : http://sourceforge.net/projects/ntfsfree/