I have been experimenting with different types of computer scrap, including HDDs, or hard disk drives. Hard drives are an impressive feat of computer, mechanical, and materials engineering; And as far as I'm concerned, engineering in general. Hard drives are composed of several main components, namely the magnetic actuator, the small write head, the platinum-plated aluminum platters, the circuit boards, a small motor, an aluminum block, and a stainless steel cover.
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| A disassembled hard drive showing the platinum alloy plated platters, the neodymium magnet bracket in the top right, the aluminum case, and the stainless steel cover on the left. |
I first became interested in hard drives when I disassembled one to harvest its super magnets. These magnets are made of a standard neodymium iron boron composite (NdFeB). Neodymium is a rare earth metal that corrodes rather quickly. To fix this, the magnets are plated with nickel.
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| Because NdFeB magnets corrode in air fairly quickly, nickel is electroplated onto the magnet and bracket. |
These magnets are quite powerful, almost dangerous if they are strong enough. This poses a threat to computers, seeing as most data is magnetically sensitive (at least to some degree). To combat this problem, computer engineers make the magnet's brackets out of an IRON, NICKEL and MOLYBDENUM based alloy called a permalloy! Permalloy has an extremely high magnetic permittivity, meaning it will stop most magnetic fields.
I have started collecting the individual hard drive components, seeing as they are worth quite a bit more individually then as shred steel! I have a box that I put the aluminum base, the supermagnets and brackets, and the stainless steel covers.
Last I checked, I could get a little more than copper price for my permalloy brackets. I shopped around at some of the bigger yards, but they thought it was too small of a amount to be worth their time. At the family owned place near me, I can get over $3 per pound for the brackets.
Also in every HDD are platinum alloy plated platters. The extreme mirror finish attests to the platinum coating, and if you cut the disk, you can see it is made of aluminum. These mirror like disks have such a small amount of platinum, that it is completely worthless to try to harvest. You will, however, see people selling mass quantities of hard drive platters on Ebay for just that reason though.
If you are considering harvesting the platinum from the hard drive platters, GOOD LUCK; The coating is atoms thick, and is at most 40% platinum ALLOY. I have had some questions regarding refining this platinum coating, and I can assure you it is not lucrative unless you have TONNES of hard drives. We are talking platinum in the parts per billion. For more info, check out http://www.goldrefiningforum.com/
More recently I have learned that artists will buy these old hard drives for use in crafts and projects; the coolest of which I have seen is this clock:
If you are considering harvesting the platinum from the hard drive platters, GOOD LUCK; The coating is atoms thick, and is at most 40% platinum ALLOY. I have had some questions regarding refining this platinum coating, and I can assure you it is not lucrative unless you have TONNES of hard drives. We are talking platinum in the parts per billion. For more info, check out http://www.goldrefiningforum.com/
More recently I have learned that artists will buy these old hard drives for use in crafts and projects; the coolest of which I have seen is this clock:
This clock has a special microprocessor that times the oscillation of a set of LED lights such that it displays the correct time. Not bad, considering the platters rotate at
10,000 rpm. Learn more here.
10,000 rpm. Learn more here.
Hey man, how about a "how-to" on how to dissect these? I have a stack of about 75 of them on my workbench. I took a 'sledge to one for the magnet a long time ago but the rest are untouched. I can't find small enough to get the star-bit fasteners off.
ReplyDeleteTo take them all mine apart I bought a precision Torx set here: Ebay. It ended up only costing me like 3 dollars. I just check and there are several sets up for 2.50. Here is a link to a set that is buy it now, and only costs $2.79 with free shipping. Thats a really good deal, even though its a pretty crappy little thing made in china; it gets the job done. I just take the bits I get from the set, and use my power drill to take out the screws. It can be a tedious process, but it is not bad if you want to harvest the individual pieces. I hope this helps, and I may come out with a more detailed post on my blog soon!
ReplyDeleteThanks for the question,
If you don't have a Torx driver find an appropriate flat-headed jewellers screwdriver: it did the trick for me!
ReplyDeleteI've found that smaller (laptop) hard drive platters are commonly made of glass.
ReplyDeleteAlso, I like to use a jaw-type gear puller to pop the motor assembly from the case. Since they are epoxied in to the aluminum. That way I can get #1 aluminum price for the shell.
I have a torx bit set and a drill. Cos theres lots of screws but they arent locked too tight drill is perfect. Cuts time by about 2 thirds - useful if you have a big batch of drives.
ReplyDeleteHeartkill
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