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EEVblog 1398 - Western Digital RED 6TB Hard Drive TEARDOWN

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EEVblog:
Dave's Western Digital RED NAS hard drive failed. Bugger the warranty, teardown time!



Failure video:

gjsmo:
@EEVBlog The head assy is undoubtedly machined out of a single piece of metal. We regularly make parts more complex than this at my workplace. There's no good reason I can see to cast it - the part is fairly small and that level of precision requires post-machining operations regardless. That doesn't necessarily mean that it's done using conventional machining, I can certainly see a possible use for wire EDM here.

The housing on the other hand is undoubtedly cast, with certain areas post-machined (motor spindle mount, head mount etc). As it's larger and doesn't require much precision except in a few areas, that would seem like the most likely candidate. The soft corners are a giveaway too.

Rdx:
Wire EDM seems way too expensive for such a component (and this quantity).

Where do the 4 parallel connections of the main motor flex bugger off to?

Also, the head coil, how does that work? I can not exactly wrap my head around the magnetics going on between that weirdly shaped coil and the two magnets tbh.

eti:
Dave, the “dessicant bag” is not that. It is, in fact, a special pad to collect stray oxide particles which are shed and flung off the discs, hence its height and position.

gjsmo:
@Rdx It depends entirely on the precision required. I would assume the moving assembly needs to be fairly well balanced, but as I don't work in the hard drive industry I couldn't tell you how well.

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