Partition Magic 8.05 Error 302

I have added a new HDD (Disk 2) for backup reason of my XP system (without MBR, just data)

 

Restore System Partition (XP) with Acronis to the new Disk (NTFS Primary) without MBR

 

After restore I have access to all my data on Disk 2 (as it should be)

 

Restarting the system (from my basic XP system on HDD 1) and checking available HDD's shows now HDD-2 "hidden".

 

Run Partition Magic to unhide HDD2

 

System must be restarted to complete operation

 

Partition Magic starts and receives error 302

 

Have to restart the basic system as usual and the Hdd2 still "hidden"

 

What is error 302?

 

I have no idea why after restore the HDD 2 all seems perfect and after restart the system the partition is "hidden"