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A comment on SanDisk SD memory card 'largest ever'. Parent comment
In two dimensions, for simplicity's sake, since a micro SD is obviously slimmer than a regular SD:
512GB SD = 768mm^2
128GB Micro SD = 165mm^2
SD = 0.667 GB/mm^2
Micro SD = 0.776 GB/mm^2
If we add the third dimension the efficiency of a Micro SD will be even greater compared to a SD.
Source: http://en.wikipedia.org/wiki/File:SD_Cards.svg
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In two dimensions, for simplicity's sake, since a micro SD is obviously slimmer than a regular SD:
512GB SD = 768mm^2
128GB Micro SD = 165mm^2
SD = 0.667 GB/mm^2
Micro SD = 0.776 GB/mm^2
If we add the third dimension the efficiency of a Micro SD will be even greater compared to a SD.
Source: http://en.wikipedia.org/wiki/File:SD_Cards.svg