On Sep 19, 2012, at 5:03 AM, Günther J. Niederwimmer wrote: > Hello, > > can any tell me, why the GPT Table is broken by a linux installation What format superblock? I will guess it's 1.0 which stores the superblock at the end of the disk and may be stepping on the secondary GPT header. And then when you repair the GPT, you're wiping out part of the md superblock so it breaks your RAID. It's confusing that the GPT table is created with diskpart, instead of parted. Chris Murphy-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html