I want to return my crucial mx300 to amazon, but first I have to secure erase all data on it. I don't have any particularly sensitive files, I'm worried mainly about passwords. Unfortunately I have snow leopard (10.6.8) installed on it, so it won't be possible to use FileVault. Searching in the answers to similar questions I found this method which could be handy in my case:
"I found a workaround. Restart the computer and hold option to enter the setup screen. Go into disk utility and select the drive. Erase the drive using "Mac OS Extended (Case-sensitive, Journaled, Encrypted). Make a password for the encryption, it doesn't matter what it is because you won't need it. Hit "Erase". Now select the volume and the "Erase Free Space" and "Security Options" buttons should no longer be grayed out. Click and select your level of security and off you go. I presume "Erase Free Space" and "Security Options" should do the same thing because you just erased the drive so all space is considered free. This worked for me so let me know if it helps."
Will it be enough? Do you know other methods I can use?