Added a few bits.
Hard drives are a good place for a lot of small payouts. There's no real garbage in them. Modern drives.
The top of the case is a glued two-ply cap. The magnetic layer is 446 or 505 stainless The aluminium layer is a high grade spun al.
The case is a molded (cast) aluminium, not die cast and is a small bit more valuable.
The magnet(sl) vary but are usually cobalt or neodymium. The backing of the magnets, the big plates, are a special alloy of carbon chromium and aluminium known as permaloy (and various similar spelled trade names).
The motors should be placed slightly higher than cbm since they are aluminium cased, not steel.
Platters have multiple variations. Base metal is either a high grade plate spun aluminium or a special steel known as hematare which is a hematite, carbon, iron, glass. microplating is palladium or platinum. Value ranges fro 10c-70c so boardsort is in the right range on buying them unknown.
The heads are spun aluminium, remelted and cast. The pickup is almost always rhodium. The wire will be gold or rhodium. The run 50-70c/lb Pickups run $1200-1250 /lb Wire is $860-939/lb The io connector will be gold pin connector or pin-board. Depending on the format and run 50c-1.50/lb.
The screws are all brass or low 300 series stainless. The two to 6 pegs are either brass or aluminium. The magnetic magnet stoppers are almost always cobalt. (The tiny black dots in a plastic arm). The flat wire is either silver plated nickel or gold plated nickel and will go high grade. 1.20-1.50/lb as of yesterday. Unless it was a SAS drive which, so far, has always been a clean pure 22k gold wire, sell as gold laminate for $50-$75/lb the wire will be black on the outside and look like black plastic with dull, almost brass looking connectors. Some high speed drives like the raptor and SG thunderball also have them.
If you are buying them whole stay under 50c/lb Lb and you're making money.
The catch is finding a large enough yard to buy the scrap by grades and friendly enough to do so in small amounts.
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