数据字节单位

 1B (byte 字节)； 
  1KB(Kilobyte 千字节) = 2^10 B = 1024 B； 
  1MB(Megabyte 兆字节) = 2^10 KB = 1024 KB = 2^20 B； 
  1GB(Gigabyte 吉字节) = 2^10 MB = 1024 MB = 2^30 B； 
  1TB(Trillionbyte 太字节) = 2^10 GB = 1024 GB = 2^40 B； 

------------- big data 
  1PB(Petabyte 拍字节) = 2^10 TB = 1024 TB = 2^50 B； 
  1EB(Exabyte 艾字节) = 2^10 PB = 1024 PB = 2^60 B； 
  1ZB(Zettabyte 泽字节) = 2^10 EB = 1024 EB = 2^70 B； 
  1YB(YottaByte 尧字节) = 2^10 ZB = 1024 ZB = 2^80 B； 
  1BB(Brontobyte ) = 2^10 YB = 1024 YB = 2^90 B； 
  1NB(NonaByte ) = 2^10 BB = 1024 BB = 2^100 B； 
  1DB(DoggaByte) = 2^10 NB = 1024 NB = 2^110 B；