I would like to point out an issue about the systemd initialisation system under Debian Jessie.
Symptoms: the initialisation system enters an infinite loop while checking partitions.
To fix this issue: -Verify that the problem concerns /etc/fstab - Edit the GRUB kernel command (enter edit mode with the "e" key) and remove the "quiet" parameter.
-You can use a live system like SystemRescueCD (console mode) to delete all the auto instances of the /etc/fstab file relating to file systems which are permanently connected to the system (such mass storage peripherals..).
-You can also add the noauto parameter in the mount options.