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1英文字符(word,字符) = 2byte;[ASCII, Unicode, UTF-8]
1中文字符 = 2byte(B) [ASCII,Unicode];
1中文字符 = 3byte(B) [UTF-8];

1B(byte，字节) = 8 bit(见下文);
1KB(Kibibyte，千字节) = 1024B = 2^10 B;
1MB(Mebibyte，兆字节，百万字节，简称“兆”) = 1024KB = 2^20 B;
1GB(Gigabyte，吉字节，十亿字节，又称“千兆”) = 1024MB = 2^30 B;
1TB(Terabyte，万亿字节，太字节) = 1024GB = 2^40 B;
1PB(Petabyte，千万亿字节，拍字节) = 1024TB = 2^50 B;
1EB(Exabyte，百亿亿字节，艾字节) = 1024PB = 2^60 B;
1ZB(Zettabyte，十万亿亿字节，泽字节) = 1024EB = 2^70 B;
1YB(Yottabyte，一亿亿亿字节，尧字节) = 1024ZB = 2^80 B;
1BB(Brontobyte，一千亿亿亿字节) = 1024YB = 2^90 B;
1NB(NonaByte，一百万亿亿亿字节) = 1024 BB = 2^100 B;
1DB(DoggaByte，十亿亿亿亿字节) = 1024 NB = 2^110 B;