Make sure you understand that and are comfortable with that potential before proceeding. For users with an SSD drive, it is important to note that using the secure formatting options such as 7 pass and 35 pass can potentially lead to a shortening of the drive’s lifespan or loss of performance, although TRIM is believed to reduce that risk. The first time is not the secure erase, it is the second time you achieve the desired result. This is really a temporary fix as you will technically erase the drive twice in the process.
The most obvious solution to this problem is to boot the Mac from an external startup disk (here is how to make one for Mountain Lion), but that’s not always an option for everyone, but luckily there is a solution that allows you to perform a safe wipe directly from the recovery partition itself. Still, many users want the ability to securely delete data from SSD. The exact reason for this isn’t entirely clear, although some speculate that writing 1’s and 0’s to an SSD can lead to performance degradation and a shortening of the drive’s lifespan, and this persists even in the most recent versions of OS X, suggests it’s not just a bug. The latest Macs come with a recovery partition instead of a separate external reinstallation disk, and if you’ve ever rebooted a newer Mac, iMac, MacBook Air, or MacBook Pro with a recovery partition SSD to reformat the drive, you may have noted that by default the “Security Options” button is grayed out in Disk Utility options, seemingly preventing a standard “secure” erase procedure. So after a lot of requests from our users here is a guide about How to Secure Erase a Mac SSD / Hard Disk from Recovery Mode. Check tutorial of How to Secure Erase a Mac SSD / Hard Disk from Recovery Mode
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