| ▲ | tliltocatl 7 hours ago | ||||||||||||||||||||||||||||||||||||||||||||||||||||
I think the article is wrong in its core premise. While the electrons get added or removed from the floating gate, the total number of electrons in the SSD chip stays the same. Gates are capacitors, in order to add electrons to one capacitor plate, you have to remove an equal numbers of electrons from the other plate, i. e. from the transistor channel. The net charge of a SSD chip is always zero. Otherwise it would just go bang. <s>2.43×10^-15</s> [my bad 1] 2.67×10^15 electrons is about 300µC - that's a lot of charge to separate macroscopically. Therefore the mass (weight is a different thing, through it is proportional to mass at a given constant gravity potential) of the data on a SSD isn't fundamentally different from a HDD - they both are caused by a change of internal energy without any change in the number of fermions. I'd expect data on SSD to have larger mass change because a charged capacitor always store more energy than a discharged one, while energy of magnetic domains is less directional and depends mostly on the state of neighbor domains - but I'm not sure about this part. [1] Thanks stackghost. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| ▲ | nickcw 5 hours ago | parent | next [-] | ||||||||||||||||||||||||||||||||||||||||||||||||||||
> So, assuming the source material is correct and electrons indeed have mass, SSDs do get heavier with more data. That is definitely wrong! No way the source material has more electrons. The only way it could do that is by being charged. Richard Feynman, The Feynman Lectures: "If you were standing at arm's length from someone and each of you had one percent more electrons than protons, the repelling force would be incredible. How great? Enough to lift the Empire State Building? No! To lift Mount Everest? No! The repulsion would be enough to lift a "weight" equal to that of the entire earth!" From: https://tycho.parkland.edu/cc/parkland/phy142/summer/lecture... | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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| ▲ | stackghost 6 hours ago | parent | prev | next [-] | ||||||||||||||||||||||||||||||||||||||||||||||||||||
>2.43×10^-15 electrons I believe TFA reads 2.43×10^-15 kg, not electrons. Unless SSDs are creating new and exciting physics, one can't have less than one electron, as it's an elementary particle. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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| ▲ | zahlman 6 hours ago | parent | prev [-] | ||||||||||||||||||||||||||||||||||||||||||||||||||||
TFA started out seeming well enough written but definitely turned LLM-padded in the middle. And yeah, I think you're right about the actual science. | |||||||||||||||||||||||||||||||||||||||||||||||||||||