Greetings @anthonyabboud,
The analysis from @bw908, is correct. The auto property will attempt to automatically mount the specified devices, whether or not these devices are ready or available at boot. In a sense this property is not very “smart” and will do literally what is asked of it.
As already mentioned you either want noauto or nofail. If you go over the post that I referred to you previously: Automatic mounting of sdcard on boot
The user here stated:
i want the system to still be able to boot incase the sdcard is not present. therefore i have added the nofail option.
Best Regards,
Jeremias