ReadyNAS Pro 4 & WD MyBook Duo - wrong drive size

When I ssh to my NAS, and do an LS, I see the following:

GeoffNAS://# ls -l
total 23068
lrwxrwxrwx 1 root root 16 2010-03-15 19:48 addons-config -> /c/addons-config
lrwxrwxrwx 1 root root 10 2013-12-11 16:01 Backups -> /c/Backups
drwxr-xr-x 2 root root 4096 2014-10-12 19:52 bin
drwxrwxrwx 17 root root 4096 2014-12-16 10:32 c
drwxr-xr-x 17 root root 4740 2014-12-30 20:26 dev
drwxr-xr-x 75 root root 4096 2014-12-30 20:26 etc
-rw-r--r-- 1 root admin 23500800 2014-03-01 18:42 files.tar
drwxr-xr-x 6 admin admin 4096 2009-10-02 19:15 frontview
-rw-r--r-- 1 root admin 84 2011-12-05 22:45 GeoffNAS_00223FA9CC14
drwxr-xr-x 4 root root 4096 2008-03-11 20:56 home
-rw-r--r-- 1 root root 37 2011-11-13 22:50 hu ??v ?LogF?
drwxr-xr-x 2 root root 4096 2007-09-07 13:53 initrd
lrwxrwxrwx 1 root root 9 2012-02-13 16:59 iTunes -> /c/iTunes
lrwxrwxrwx 1 root root 12 2013-04-28 23:14 KR-Photos -> /c/KR-Photos
drwxr-xr-x 14 root root 4096 2014-10-12 19:52 lib
drwxr-xr-x 2 root root 4096 2014-10-12 19:52 lib64
drwx------ 2 root root 16384 2010-03-11 12:19 lost+found
lrwxrwxrwx 1 root root 8 2013-09-22 19:03 media -> /c/media
drwxr-xr-x 2 root root 4096 2006-10-28 10:06 mnt
drwxr-xr-x 2 root root 4096 2010-03-15 19:44 Monitor
drwxr-xr-x 6 root root 4096 2011-06-27 19:20 opt
dr-xr-xr-x 133 root root 0 2014-12-30 20:25 proc
drwxrwxrwt 2 root root 0 2014-12-30 21:53 ramfs
lrwxrwxrwx 1 root root 12 2014-12-28 00:45 RNXconfig -> /c/RNXconfig
drwxr-xr-x 3 root root 4096 2014-10-12 19:52 root
drwxr-xr-x 2 root root 4096 2014-10-12 19:53 sbin
lrwxrwxrwx 1 root root 11 2010-03-11 19:13 Software -> /c/Software
drwxr-xr-x 12 root root 0 2014-12-30 20:25 sys
lrwxrwxrwx 1 root root 7 2010-03-11 19:14 Temp -> /c/Temp
drwxrwxrwt 10 root root 4096 2014-12-30 21:39 tmp
lrwxrwxrwx 1 root root 11 2010-03-11 19:13 Torrents -> /c/Torrents
drwxrwxrwt 3 root root 60 2014-12-30 20:26 USB
lrwxrwxrwx 1 root root 14 2012-02-06 21:49 USB_HDD_1 -> /USB/USB_HDD_1
lrwxrwxrwx 1 root root 14 2014-12-30 20:26 USB_HDD_3 -> /USB/USB_HDD_3
drwxr-xr-x 12 root root 4096 2009-01-14 09:52 usr
drwxr-xr-x 17 root root 4096 2014-10-12 19:53 var
lrwxrwxrwx 1 root root 10 2010-03-15 19:48 webroot -> /c/webroot
GeoffNAS://#

I will note that the Frontview Control Panel shows USB_HDD_3, and not USB_HDD_1... so the NAS can see both, but is choosing to focus on 3, for some reason. And I can't seem to change that from my laptop (OS X 10.10), no matter what I do.