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Just recently a 200 (yes, 200) GB card has been announced by some flash memory manufacturer. The question is not about the giant capacity this card has or how they are made, but the peculiar number on it.

I always thought memory cards had only capacities measured by powers of 2: 32, 64, 128 because of the binary representation of electricity and the subsequent multiplexing of memory addresses… Taking this into account the next card should have been 256 GB by once again doubling the memory cell density, but it’s 200 GB… Any insight on why is this?

Community
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ibelcomputing
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2 Answers2

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It might not apply to your SD card, but I have seen very cheap USB sticks with unusual capacity and the reason was: the production could not ensure the quality of all 128 MB (yes, that was MB time), so the capacity was set to whatever could be ensured during the testing process.

Applied to your 256 GB SD card, that would mean: it is produced with 256 GB in mind, then the defective parts are crossed out, leaving you with tested and guaranteed 200 GB (+ perhaps some spare GB for self recovery).

Thomas Weller
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Use existing technology of 128GB, plus an optimized way of holding 64GB and 8GB. 128 + 64 + 8 = 200

Kirill2485
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