![osx_partitions](https://misapuntesde.com/images/2016/03/osx_partitions.png)
If you have two operating systems installed on your *OSX* is quite annoying that you automatically mount those two partitions. Running this simple line you will prevent mount the partition that you do not use.
Just type the next:
echo 'UUID='$(diskutil info /Volumes/XXX/ | grep 'Volume UUID' | awk '{ print $3 }') 'none hfs rw,noauto' | sudo tee -a /etc/fstab
Where *XXX* is the partition that you **DON'T** want to be mounted automatically. In case you want to access the other partition in read-only mode, replace *rw,noauto* with *ro*.
It's usefull to connected external drives, too. If the file format is *NTFS*, change in the previous line *hfs* with *ntfs*.
To undo the changes, delete the line added in */etc/fstab*.
Now it restart to check if it's works.