I read this lifehacker article with regards to easily recoverable data on SSD post-formatting.
What do you guys recommend?
Edit: Returning for a sale return. Sorry should of included that originally.
Since the problem is that the you don't have control over the physical location of the data it seems that one approach would be to fill the disk. In Linux you could do
In that way you are writing the entire disk. But I'm not 100% sure about "spare" sectors.
I would recommend good risk analysis.
Loading erased (overwritten) data from SSD isn't trivial task. Average new buyer is not going to try it. If there isn't something very very important (military secrets? Large database containing personal information? Something that'll get people killed?), I wouldn't bother to care more than normal wipe/format (not quick format, though).
In the future: if you want to save secret data to SSD, I recommend using full disk encryption whenever possible. That way recovering data isn't that big problem, assuming your encryption passphrase is long enough.
Intel has a tool as part of their Intel SSD toolbox (version 2.0 and above) that allows you to really, securely wipe an SSD. I'm not sure if its intel only or not.
However, there is some extra protections built into the tool. It can't be the boot drive, and can't have any partitions on the drive (so you'll have to delete the partitions). They are described pretty well in the manual (download the PDF Manual), about page 20 or so.
Edit*. Also, you can use a linux boot drive or disk, and follow the steps here to issue a ATA Secure Erase command. (its a command built into the drive itself).
Keep in mind, that lifehacker article was also dealing with people that de-soldered and physically removed the flash chips from the drive, and created and programmed their own controller to read data directly off the microchips.
Since it completely destroys the drive, not many people are going to do that to find out what web pages you might have visited in your browser cache...
If you have data that is THAT critical, you can just destroy the drive with a hammer, buy a new drive, and return it with that.