FreeBSD warning about unclean filesystems which won't be mounted

[Bruce Cran]

I was in the process of reinstalling a machine today and had installed 9-
CURRENT to a 512MB flash card. After reconnecting an HDD which had dirty 
filesystems on it and booting I was surprised to see a message:

Trying to mount root from ufs:/dev/ad2s1a
WARNING: /home was not properly dismounted
/home: mount pending error: blocks 76 files 0

But, /etc/fstab just contains:

/dev/ad2s1a	/		ufs		rw			1	1	
/dev/acd0		/cdrom	cd9660	rw,noauto		0	0

Should FreeBSD be reporting errors on filesystems it hasn't been asked to 
mount yet?

-- 
Bruce Cran