basically its a proprietary raid system, like any raid system if the raid controller dies the only way to recover the data is with the same type of raid adapter (not true of all raids) and because nobody else uses Drobo's format basically you need another drobo to get it back, and even then I dont know if its possible
so if the mainboard / controller inside the drobo dies you would have to buy another one or send it to them to repair it
I dont understand the problem you posted, you cant access them why? once your able to get back into them move them off / format it and move them back
try calling their tech support I would be curious as to their answers