/dev/ufs/ no such file or directory

I was struggling for quite some time with my USB backup drive attached to NAS server based on FreeBSD. From time to time, during boot time, I was getting error

/dev/ufs/usbstorage no such file or directory

and machine was going into single user mode. It turned out, that adding late inside /etc/fstab was enough to solve the issue.

/dev/ufs/usbstorage   /media/usbstorage   ufs   rw,late   0   0

It solved the problem of missing location during the boot time.