@Macabre
When i copy from cd-rom to zip or DH0: (DH0 < 4gb limit) it go's well, and if i copy from DH0: to dh3: (above 4gb limit) it go's wel to, but from CD0: to DH3, then some partitions gets corrupted.
Whether and how the partitions get corrupted is all up to luck.
If you try long enough with enough data you will also manage to corrupt it by copying from DH0, too.
What does Check4GB say about the DH3 partition?