Hi, i want to add a new metadevice /dev/md3. In /var/log/messages i find : ...... kernel: md: 08.21: invalid raid superblock magic (0) on block 4233088 what does it mean? Problem is, i cant mdrun /dev/md3 , because there are an error message: invalid argument. /dev/md3 was build with mdcreate. my mdtab is: /dev/md3 raid1,8k,0,9c02e979 /dev/sdc1 /dev/sdd1 how can i solve this problem?? thanx.olaf. [EMAIL PROTECTED]