whollygoat@xxxxxxxxxxxxxxx wrote: > Can anyone provide any more insight with the below? I agree the error messages don't help :) Old version of mdadm? IIRC the error reports are better now. > fly:~# mdadm --zero-superblock /dev/hdk1 > mdadm: Unrecognised md component device - /dev/hdk1 It is likely that hdk1 is not an md component device and has no superblock. > fly:~# mdadm -a /dev/hdk1 > mdadm: /dev/hdk1 does not appear to be an md device Normally: mdadm [mode] <raiddevice> [options] <component-devices> so: mdadm /dev/md0 -a /dev/hdk1 would work (otherwise which raid are you adding to?) David -- "Don't worry, you'll be fine; I saw it work in a cartoon once..." -- 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