hi,
how to understand "SECURITY_UNLOCK: Input/output error" ?

is it because the passwd is wrong or the disk is not working as hdparm
expect ?

can you post your dmesg following this error ?

because i am facing a similar issue 
-- 
http://rzr.online.fr/q/ata

-- 
hdparm fails to handle security configuration...
https://bugs.launchpad.net/bugs/487168
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