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Brian

Question on NAND speed

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Via email:

Hi there, I'm just wondering are more dense flash chips slower than less

dense chips? As I understand it the reason for the slow down from 34nm to

25nm transistors was because there were fewer NAND chips used which ment less

channels were connected to the controller, but does the actual increased

density of the chips make them slower? For example, when using a water filter

the more dense the material the slower the water will drain. Do flash chips

follow the same principle?

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I think it would be irrelevant, or at least a direct comparison might be impossible, since better flash memory communication standards enable higher transfer speeds as well...

Voltage switching levels and whatnot are all still effectively the same speed, the main thing that I think might POTENTIALLY (I don't think it actually would) slow things down is going from SLC to MLC to multiple-bit (3-bit or 4-bit) MLC...

Don't think electrons slow down like the e-mailed questioner is describing. ;)

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The "density" in SSDs is different from the density in filters. In filters, the point is for the substance to get entirely from one side to the other. In SSDs, density refers to how many single-bit "boxes" are available in a certain amount of space. The smaller the manufacturing process, the more "boxes" can fit in the same area. However, the transfer of data happens inside these "boxes," depending on whether they are positively or negatively charged, and so the speed of transfer is not fundamentally related to the "density" of the SSD but more to the structure of the "boxes" and how they are connected.

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