There are 2 methods you can use to SE your Agility 3:
1.) SE your drive with the OCZ Toolbox program. Since SE wipes your SSD the Toolbox has to be run on another drive with an O/S on it. If you don’t have a spare drive then connect your SSD as a secondary drive to a friend’s pc.
2.) SE your drive with the Linux bootable tools.
a.) Download a Linux .iso file from OCZ’s website and burn it to a CD.
b.) In your motherboard’s BIOS change your 1st boot device to your CD drive.
c.) Boot into Linux and double-click an icon that says "Secure Erase".
Method 2 is probably the easiest, you don’t have to open your pc.
You can also use the same CD to update the firmware on your drive if it is not on the latest version.
Here’s the link to the Toolbox: http://www.ocztechnology.com/ssd_tools/SandForce_Based/
Here’s the link to the Linux bootable tools:
http://www.ocztechnologyforum.com/forum/showthread.php?99275-NEW!-Bootable-tools-for-OCZ-SSD-s