My husband and I own a scrap yard. I take apart the hard drives completely. The body of the hard drive is cast aluminum at our plant, I sell the platters, the magnets, and the arms of the hard drives on ebay as I get more for them than just recycling prices, the spacers are either aluminum clip, or stainless, you will be able to tell by the weight. Clip is raw aluminum, nothing else attached to the material, stainless is a bit heavier, but they are usually clip (MLC).
The top of the hard drive varies (hard drive cover), if it sticks to a magnet, I found Seagate usually does, it is steel, if not, it can be dirty stainless or dirty sheet, this will depend on if the top of the hard drive case is easy to scratch which aluminum is then it is dirty sheet, or if you really don't see the scratch at all, it's dirty stainless and I mean dirty because there is a fill of some type between the layers of the metals that make up of the hard drive cover. If there is no fill between the layers and it is aluminum than it can be clean sheet even with the sticker, but ask at your plant to see what their ratio is for sheet material. Now I know i just confused you even more, my husband has been managing recycling metals for over 27 years, for me it is about 2, it is a lot to learn but you catch on as you go along.
So if you are selling them as steel you are wasting your money, honestly, also, they really are not steel they are more of a Breakage as the majority of the materials are an aluminum type metal. So if someone is offering you steel than they might not have a breakage price, but always ask. If I only took the boards off I would put them in my breakage box, this pays higher than steel.
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