Mounting a hard disk in FreeBSD

I have just installed a second hard disk on a FreeBSD machine v8.0. It is seen as new hardware:

# dmesg | grep ad4
ad4: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata2-master SATA300
ad4: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata2-master SATA300

However it is not listed in fstab where "ad4" would have been expected:

# cat /etc/fstab 
# Device		Mountpoint	FStype	Options		Dump	Pass#
/dev/ad6s1b		none		swap	sw		0	0
/dev/ad6s1a		/		ufs	rw		1	1
/dev/ad6s1e		/tmp		ufs	rw		2	2
/dev/ad6s1f		/usr		ufs	rw		2	2
/dev/ad6s1d		/var		ufs	rw		2	2
/dev/acd0		/cdrom		cd9660	ro,noauto	0	0

When doing "mount -a" no response is given, but certainly the new hard drive was not mounted, because fstab is still the same table as above. What do I do to mount this hard drive?

I might be severely mistaken, but as far as I know /etc/fstab isn't auto-generated, nor reflecting the currently mounted partitions. Did you create a BSD label on the disk? Slices? Partitions? Created a filesystem? If not, the FreeBSD handbook has a section on adding new disks.

Thank you for your response. It still has not worked, but the pointer is definitely helpful. Upon new issues encountered, I will be posting back again.