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Date:      Fri, 20 Mar 2015 14:51:38 -0600
From:      jd1008 <jd1008@gmail.com>
To:        FreeBSD Users <freebsd-questions@freebsd.org>
Subject:   hdparm: Unable to change master passsword
Message-ID:  <550C885A.6050307@gmail.com>
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hdparm -I /dev/sdc
.
.
.
.
Security:
         Master password revision code = 65534
                 supported
                 enabled
                 locked
         not     frozen
         not     expired: security count
                 supported: enhanced erase
         Security level high

# hdparm --user-master m --security-unlock thepassword /dev/sdc
security_password="thepassword"

/dev/sdc:
  Issuing SECURITY_UNLOCK command, password="hdparm", user=master
SECURITY_UNLOCK: Input/output error

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