Recovery Partition Visible from Finder

Hello,

I tried to do a fresh install from the recovery partition after upgrading to El Capitan. I wanted to zero out all the data in Disk Utility instead of a quick format. The option was not available anymore.

So I booted from a linux USB key and zeroed out the data only on the Macintosh HD partition, rebooted, went back in OS X's recovery mode and re-installed OS 10.11.

Now, my recovery partition is visible from the Finder. I wonder if that happened to anyone else or if somebody know what could have happened.

I plan to simply follow this Prevent a volume from mounting at startup to solve the problem.

Any thoughts?

Thanks you,

François