Sorry but reformatting your hdd does not get rid of the data on it. Even Zero'ing your drive does not entirely remove data. And even multiple passes of writing 0's and 1's will not deter a forensic expert (who specializes in data recovery) who wants the data from a working drive.
If you want to sell a working computer, then I suggest removing the hdd and putting in a newly purchased one. Yes that involves cost.
You can also sell computers without any physical drive (but you might only get a computer techy to purchase it that way or a parts depot).
At work, we physically remove the hdd from all our computers before they go to "disposal" and literally void them (take off the cover and take out the patters from within the drives and take a hammer to them). Okay maybe a bit extreme; but security is a concern.
If you are concerned about data residing on the hdd, then you should not sell it with the computer.
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