GoFlexHome not booting from disk

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I've managed to build FreeBSD 11.1 for armv5 so that I can boot up my
GoFlex Home from USB but when I copy the same files to a hard disk it will
not boot.

Could anyone suggest what I need to check?

I have logs for both instances and can display them if necessary, but the
main difference is the when attempting to boot from USB I get the
following:-

***********************************   USB
************************************************************

Initializing devices...
starting USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 2 USB Device(s) found
       scanning usb for storage devices....
Use USB retry period from the environment: 15 second(s)
1 Storage Device(s) found

Reset IDE: ide_preinit failed
Loading envs from usb 0...
reading /boot/uEnv.txt
146 bytes read in 63 ms (2 KiB/s)
... envs loaded
importing envs ...

reading ubldr
295973 bytes read in 85 ms (3.3 MiB/s)
## Starting application at 0x01000098 ...
Consoles: U-Boot console..
Compatible U-Boot API signature found @0x7b12860

FreeBSD/arm U-Boot loader, Revision 1.2
(Thu Nov 30 14:06:37 GMT 2017 root at Test)

DRAM: 128MB
Number of U-Boot devices: 2
U-Boot env: loaderdev not set, will probe all devices.
Found U-Boot device: disk
  Probing all disk devices...
  Checking unit=0 slice=<auto> partition=<auto>... good.
Booting from disk0s2a:

***********************************   IDE
************************************************************
Initializing devices...
starting USB...
USB0:   USB EHCI 1.00
canning bus 0 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found

Reset IDE: Bus 0: .OK Bus 1: not available..
  Device 0: Model: HTS541020G9SA00  Firm: MB1OC60J Ser#: MPBAL0X1C5LD1M
            Type: Hard Disk
            Supports 48-bit addressing
            Capacity: 19077.1 MB = 18.6 GB (39070080 x 512)
Loading envs from ide 0...
reading /boot/uEnv.txt
134 bytes read in 46 ms (2 KiB/s)
... envs loaded
importing envs ...

* Bad device ide 1 **
reading ubldr
295973 bytes read in 140 ms (2 MiB/s)
## Starting application at 0x01000098 ...
Consoles: U-Boot console
Compatible U-Boot API signature found @0x7b12860

FreeBSD/arm U-Boot loader, Revision 1.2
(Thu Nov 30 14:06:37 GMT 2017 root at Test)

DRAM: 128MB
Number of U-Boot devices: 1
U-Boot env: loaderdev not set, will probe all devices.
Found U-Boot device: net
Booting from net0:

can't load 'kernel'

******************************************************************************************************

Not sure why it doesn't identify the IDE disk as a U-Boot device....