Okay. So I see you are using PFS3? Which version are you using?
Also you are using an Oktagon.device. So an Oktagon SCSI or IDE card?
Next.
What have you partitioned the card to? DH0=How many MB or GB. DH1=How many MB or GB.
Max Transfer etc. basically how you set this up in HDToolBox.
I have a sneaky suspicion you have possibly done a 50/50 split? I.e 4GB DH0 and 3.7 DH1?
If so, as you are using an Oktagon Oktagon.device driver and 3.1 ROM you may have hit over the 4GB limit on your DH0.