What is this means?
rvp run a full fsck (fsck -f /dev/...) on the root FS?
As you can see on this photo, results no problem:

rvp Remember, we're pretty much in the dark about your setup at present.
Sure. And sorry. Very basic, just two slices, one for /, other for swap; just change the layout to FR, and install OS, and finishing with set parameters for root, system and my personal account.
$ cat /etc/fstab
# NetBSD /etc/fstab
# See /usr/share/examples/fstab/ for more examples.
/dev/wd0a / ffs rw 1 1
/dev/wd0b none swap sw,dp 0 0
kernfs /kern kernfs rw
ptyfs /dev/pts ptyfs rw
procfs /proc procfs rw
/dev/cd0a /cdrom cd9660 ro,noauto
tmpfs /var/shm tmpfs rw,-m1777,-sram%25
I'm going to add log
option into fstab file for / and reboot.
# grep wd0a /etc/fstab
/dev/wd0a / ffs log,noatime,rw 1 1
# mount -u -o log,noatime,rw /
And, now? what can I do?