I think (and it is what fvdw wanted), is to investigate first the disk state before installing our firmware.
Indeed, and I assume it is your case, if you set a raid5 on them, there are some system files stored on the data volume (raid5). So your behaviour may happen if :
- fs system on the raid is corrupted
- fw fails to assemble the raid (fail disk state on at least 2 disks)
- there is an issue (hardware) on the sata port.
So please to post the expected output (fdisk) and there are others...
Note: anyhow if you want to backup your data, you will have to do them...