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Comment: Re:shenanigans (Score 2) 386

by arielCo (#46721923) Attached to: UN Report Reveals Odds of Being Murdered Country By Country

The Venezuelan government hasn't published violence statistics for years, so NGOs and journalists query the morgues every week. But that doesn't stop the nomenklatura from denouncing the state governed by the most prominent opposition candidate as having "the most murders" (it's not clear, and not too relevant, whether they mean count or rate).

Comment: Re: how "green" is the use of them? (Score 1) 35

by arielCo (#46532621) Attached to: China Using Drones To Spot Polluters

Arguably less than the reduction in the factories it'd catch during its service life? Even if it were a pick-up truck the tradeoff is just silly.

But the thing here is that it's easier to check on a big industrial park or mining operation from the air, and a lot cheaper if the aircraft doesn't have to carry a pilot and an observer.

Comment: Re:The caps are electrolytic (Score 1) 111

by arielCo (#46367925) Attached to: Intel's New Desktop SSD Is an Overclocked Server Drive

The regulators are there - you can see the 'big' coils in TFA. The capacitance for a simple "drain till you drop" scheme would have to be a lot here - very roughly 2*Energy/efficiency/(Vddmax^2 - Vddmin^2). So, step the voltage up optionally, keep the caps charged as high as practical, squeeze them dry when needed through a step-down converter.

TFA also says that the drive periodically monitors the "status" of the caps; I'm not sure if that means charge level or charge-holding capacity but it could test-discharge one cap at a time.

Comment: Re:The caps are electrolytic (Score 4, Informative) 111

by arielCo (#46365543) Attached to: Intel's New Desktop SSD Is an Overclocked Server Drive

The caps only need to supply enough juice to sync the RAM buffers to flash to ensure consistency of its internal block-mapping metadata (the filesystem should handle the rest through journaling and whatnot). The caps are rated at 35v but let's assume that they're kept at 12v: E = (12 v)^2 * 47 uF / 2 = 3.4 mJoules. Even at full operating load that should last for half a millisecond counting losses, but when power goes out the drive is going to stop serving requests and all it has to do is write that 1 GB buffer to a few flash blocks. More than enough, methinks.

Comment: Re:The caps are electrolytic (Score 4, Informative) 111

by arielCo (#46365479) Attached to: Intel's New Desktop SSD Is an Overclocked Server Drive

tl;dr: these are storage caps, which don't endure the ripple currents that kill filter caps.

Electrolyte decomposition is usually caused by high ripple current, which is why caps pop mostly (only?) when used as filters, as in motherboard DC-DC converters and gadgets powered by wall-wart adapters. In this particular application, the PSU impedance is quite low and the caps are handled by on-board regulators (V=Q/C and all that), so there's no load ripple and the caps just have to sit pretty and charged with insignificant heat losses until the computer is shut down or outage occurs. Maybe that's why Intel didn't even bother to use the solid (polymer) kind.

If these caps dry out due to age or bad quality they just won't hold as much charge for emergency sync'ing, which is still better than ordinary SSDs/HDDs with no caps.

"The medium is the message." -- Marshall McLuhan

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