md0 RAID1 can't read superblock

md0 RAID1 can't read superblock

i have a problem with my md0 array, which is an raid1 (2 mirrored USB-Sticks)
Mount gives "Can't read superblock"
cat /proc/mdstat:
Personalities :
unused devices: <none>
fdisk -l
/dev/sdc1 2048 15679487 7838720 fd Linux raid
autodetect
/dev/sdc1 2048 15679487 7838720 fd Linux raid
autodetect
mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 gives:
mdadm: /dev/sdc1 misses out due to wrong homehost
mdadm: /dev/md0 has been started with 1 drive (out of 2).
and after several tries it seems to work with 1 drive now. How do I repair
it without loss ? How do i fill /proc/mdstat if useful ?