I never use quick format, because I don't like the idea of having to overwrite and deal with defrag. why do that when you can just as easily start from a clean disk? but that's just my preference.
Or, install windows and Ccleaner (freeware), and check the box for wipe clean space. Most likely will be faster considering you are only wiping the free space and not the whole disk AND you can choose how many overwrites of data you want for it under the settings options for even more rest assurance.
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