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  CBR stands for Constant Bitrate. Basically it is a term that describes how video or audio is encoded -- constant bitrate means that the bitrate doesn't vary during the video or audio at all, but is same through the clip. CBR bitrates are very easy to use in calculations -- if you have an MP3 file that has CBR of 128kbit/sec and it lasts for 3 minutes, the amount of HDD space it takes can be calculated easily:
  
  128kbit = 128 x 1024 bits
  1 byte = 8 bits
  1 kilobyte = 1,024 bytes
  1 megabyte = 1,024 kilobytes
  3 minutes = 180 seconds
  
  180 x 128 x 1024 / 8 / 1024 / 1024 = 2.81MB