That's correct. You have a total of 11 disks in the system. Five are unassigned. Only disks not in the array are shown as unassigned. In your case sdh, sdr, sds, sdp, and sdt are unassigned. The other six disks are in the array.
The 'Seagate2' partition is not mounted, so it will not show in /mnt/disks/.
If you still think you have a total of 11 USB disks attached, they are not being recognized. There are apparently issues with the disks:
Sep 24 01:57:32 Tower emhttpd: device /dev/sdh problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sdd problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sde problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sdb problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sdf problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sdq problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sdi problem getting id
Sep 24 01:57:32 Tower emhttpd: device /dev/sda problem getting id
Sep 24 01:57:40 Tower kernel: sdh: sdh1
Sep 24 01:57:40 Tower kernel: sd 7:0:0:0: [sdh] Attached SCSI disk
Sep 24 01:57:41 Tower unassigned.devices: Disk with serial 'WDC_WD101EMAZ-11G7DA0_VCGLEWYP', mountpoint 'element1' is not set to auto mount.
Sep 24 01:57:42 Tower emhttpd: device /dev/sdd problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sde problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sdb problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sdf problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sdq problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sdi problem getting id
Sep 24 01:57:42 Tower emhttpd: device /dev/sda problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sdd problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sde problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sdb problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sdf problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sds problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sdq problem getting id
Sep 24 01:57:59 Tower emhttpd: device /dev/sdi problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sdd problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sde problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sdb problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sdf problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sds problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sdq problem getting id
Sep 24 01:58:04 Tower emhttpd: device /dev/sdi problem getting id