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370 grains is about one-and-three-fifths times as heavy as a Compact disc.
In other words, the weight of a Compact disc is 0.630 times that amount.
(a.k.a. CD)
A compact disc typically weighs 230 grains. Data is stored on CDs by encoding into the track a series of tiny pits — each between 3.5 and 850 µm (0.00014 and 0.033 in) in length.
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