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I've had some very useful assistance from people at a forum, thank you Aaron, magnus and minor.
The latest suggestion is to access the drives directly, using \\192.168.0.102\Volume_1 or \\192.168.0.102\Volume_2 in Windows Explorer.
Here's what happens . . .
First
I change the user to admin - with no password

Now put \\192.168.0.102\Volume_1 into the box, it's all there but doesn't show fully
When
Finish is clicked the system attempts to connect
But
can't find the device.
I think this is strange because if I open Windows Explorer and ask for all the computers in my workgroup this is what I get
Which
is showing the dlink server, however when I try to access it I get nothing
except a message saying it can't be found. That's the next image.