dump aborts; backsup device size issue?

[Robert Huff]

	I have an external hard drive connected by eSATA; it looks like this:

			    used   free		
/dev/gpt/backup    451G     10G    405G     3%    /backup

	However, when running dump this morning I got:

/backup clean
Disk mounted
Using /backup/Mon
Dumping to /backup/Mon/root
   DUMP: Date of this level 0 dump: Mon Jun  2 01:59:03 2014
   DUMP: Date of last level 0 dump: the epoch
   DUMP: Dumping snapshot of /dev/gpt/root (/) to 2014.Jun.2.root.dump
   DUMP: mapping (Pass I) [regular files]
   DUMP: Cache 32 MB, blocksize = 65536
   DUMP: mapping (Pass II) [directories]
   DUMP: estimated 1067897 tape blocks.
   DUMP: dumping (Pass III) [directories]
   DUMP: dumping (Pass IV) [regular files]
   DUMP: End of tape detected
   DUMP: Closing 2014.Jun.2.root.dump
   DUMP: Change Volumes: Mount volume #2
   DUMP: fopen on /dev/tty fails: Device not configured
   DUMP: The ENTIRE dump is aborted.

	(System =
FreeBSD 11.0-CURRENT #1 r264673: Sat Apr 19 09:43:10 EDT 2014 amd64
	)
	So ... trying to dump < 2 gybtes onto 405 free and "end of tape"?  I'm 
confused.
	(I could reformat the disk, but I'd like to avoid that if possible.)

	Respectfully,


			Robert Huff