/Usr was not properly dismounted Solution

After the FreeBSD system is installed today, change the/etc/rc. conf file and enter reboot to restart.
I found a problem after restarting, My users can not log on through the ttyv0-8, no matter what the user, then no way, and then restart to enter the single user mode, DF found that many areas did not go up, mount-A hangs the default partition in/etc/fstab, and a prompt is displayed.
/Usr was not properly dismounted
/TMP was not properly dismounted
/Var was not properly dismounted

Then follow the usual habits
Fsck
Fsck-y
Fsck-P
The problem persists! Khan !!
So I found this on the Internet:
In the BSD textbook, the author makes it clear that reboot and halt should not be used to perform the restart and shutdown actions, so that the system will not execute RC. the shutdown script does not allow you to set the "clear" mark on the file system. The system will automatically call fsck next time you start the system to check file system 1.
Hehe, reboot halt-P won't be used. No way. Only in this way
Warning:/was not properly dismounted

This warning is reported only when my machine is shut down abnormally.

After the system is started, the fsck will automatically run. Wait until it is checked.

Shutdown-H now/halt/reboot/

No more information.