I noticed that /usr/sbin/rebuildfstab does not add the following lines to /etc/fstab:

/dev/pts /dev/pts devpts mode=0622 0 0
/dev/fd0 /mnt/auto/floppy auto user,noauto,exec,umask=000 0 0
/dev/cdrom /mnt/auto/cdrom auto user,noauto,exec,ro 0 0

I deleted /etc/fstab and run /usr/sbin/rebuildfstab. It added lines for all HDs but not these lines.

Does any body know which script does so? Is it /etc/auto.mnt?