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0e1f616
(Get the code!)
Sorry, I was distracted by other things. So I will be attaching a proposed update to dmraid and some pre-built package to test. I just cannot promise that change will be accepted.
About converting to mdadm: That would be an option that might be more future proof but only if you do not want to use the RAIDed disks in parallel with Windows. The drivers that come with the motherboard rely on the BIOS signatures and I am not aware (I never had need, so I never searched) of any generic RAID driver for Windows that would recognize the DDF signatures that mdadm creates.
If you only will be using Linux it is a different story. Then moving to mdadm (you can then use even the normal superblock format, no strict need for DDF) would have the additional benefit of being able to replace the motherboard or move the disks to a different computer and have the RAID still working. But of course its a tedious task: you need some place to backup all data, also better make sure the backup has no bits corrupted (maybe rare but happened), erase the RAID signatures (if possible, from the BIOS), either plug the disks to a different controller or switch the current one into SATA/AHCI mode, set up the mdamd RAID and finally copy the backup back (and possibly again check for consistency). A lot of work...