1, first, K and K case is no difference (kilo), M and M is the same
2, B is a bit, that is, a bit, B is a byte, that is, Byte, 8bit =1byte, a letter a byte, a man two bytes
3, 1024B =1KB,1024KB=1MB,1024MB=1GB,1024GB=1TB
Answer 1: Why 200M
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