What do you think might work? I tried the shell but I didn't get very far. Would the copy command work?
You said "I can't access them with Dopus". I said "try to access them with something other than Dopus". Sorry if I took your words too literally, but if you can't access them with one tool, you need to find out if the problem is with the tool, or with the partitions themselves. Can you double-click and open them on the Workbench screen? CD to them in the shell, drag & drop files from Workbench, etc.?
Knowing if the partitions work correctly in any other application would help you narrow down your problem.

Cheers!