Secure erase - using hdparm

HD, SSD should be connected directly to the controller, not USB bridge or hardware RAID controller.

Use live Linux CD or USB with hdparm installed. CentOS 7 does not contain it so you can install hdparm with:

yum install hdparm -y

Boot to Linux and run the following commands as root (can use sudo if needed):

fdisk -l (then determine what disk should be sanitized, sda or sdb, etc.)

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