unable to recover software raid partition

[sdm900]

Morning

I have been trying to use TestDisk to recover a software raid partition in a GPT partition table (using Centos6.3 live cd). It all appears to work just fine


TestDisk 6.14-WIP, Data Recovery Utility, September 2012
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org

Disk /dev/sdc - 3000 GB / 2794 GiB - CHS 364801 255 63
Partition Start End Size in sectors
D MS Data 2048 1026047 1024000
D Linux LVM 1026048 5860532223 5859506176
>P Linux Raid 194560034 5860532777 5665972744 [3]

Structure: Ok. Use Up/Down Arrow keys to select partition.
Use Left/Right Arrow keys to CHANGE partition characteristics:
P=Primary D=Deleted
Keys A: add partition, L: load backup, T: change type,
Enter: to continue
md 1.x L.Endian Raid 6 - Array Slot : 4 (0, 1, 2, 3, 4), 2900 GB / 2701 GiB


It even correctly identifies it as a raid 6 partition. After a reboot, parted looks good


Model: ATA Hitachi HUA72303 (scsi)
Disk /dev/sdc: 5860533168s
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 194560034s 5860532777s 5665972744s raid


However, when I try to look at the raid superblock

[root@livedvd testdisk-6.14-WIP]# mdadm -E /dev/sdc1
mdadm: No md superblock detected on /dev/sdc1.

it isn't happy. Any ideas?

Thanks
Stu.