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I did it by the "hard way": (first if its possible clone this disk before you do anything!)

dmesg for the raid-disk or try (example: sdc1)

$ fdisk -l

Change the RAID-DISK-Flag to your Linux filesystem (ext3 or something), save this and reboot.

After that

$ mdadm --zero-superblock /dev/sdx

and voila you can mount

$ mount /dev/sdc1 /mnt