If DBAN won't work with SATA drives over the SATA controllers on the motherboard(s) you use, then you could also look at Active KillDisk.
But definitely don't just use a basic format.
Active KillDisk is only free for "single wipes", so DBAN would be the best choice, if you're looking for absolute FREE, AND absolute data destruction.
As far as a dock is concerned, I can vouch FULLY for this one:
It's by a company called StarTech. I didn't even know who they were before, but their peripheral type devices seem to be of excellent quality.
I recently picked up a few of them for myself and some other guys at church for working on media files at home, then returning them, and not one glitch out of one dock. So far, that's 4 docks and counting, as well as 2 eSata laptop (PCI Express) adapters.
Two or three years ago, I believe it was the thermaltake one that some folks had issues with overheating, even melting. If it wasn't them, it was another common name, I just don't remember for sure. However, I've not seen any such references in any reviews for the past year, I suppose.
I wouldn't imagine that you'd have to worry much about the dock overheating for straight formatting, but it is worth mentioning. Of course, I think the bozos who had the overheating issues were trying to use that as a permanent data connection for a system drive. Just not a good idea.
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