Raid1 problem can't add remove or mark faulty -- it did work

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mdstat after reboot

root@crm_svr:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath] [raid6] [raid10]
md0 : active raid1 hdc1[1]
155268096 blocks [2/1] [_U]


unused devices: <none>

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the below error shows after a boot when excuted in kde konsole

root@crm_svr:/home/rob# mdadm /dev/md0 -a /dev/hda1
mdadm: hot add failed for /dev/hda1: Invalid argument

but this error is shown from a tty console

md: could not bd_claim hda1
md: error, md_import_device() returned -16
mdadm: hot add failed for /dev/hda1 : invalid argument

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this is what shows in dmesg

md: could not bd_claim hda1.
md: error, md_import_device() returned -16
md: could not bd_claim hda1.
md: error, md_import_device() returned -16
md: could not bd_claim hda1.
md: error, md_import_device() returned -16

i had this bd_claim error when i first tried to build the array
but it went away when i wiped every thing and started over
this box is the only time i have seen this error and i
tried using different drives -- but of the same type -- when
the problem  showed up on the initial build




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