I have FS-100 like yours. It seems that e my hard drive 100GB died. I got WD 250GB hard 2.5“, and I like to put in place the old, but I have same problem as you. I don`t have BIOS for that. Can you halp me? I do not know which software is needed is acknowledged a new 250GB disk vd, but I suppose that we should be 4.0.1. although I’m not sure.Thank you in advance