Measures of Size of Data Bit - one binary digit Nibble - four binary digits Byte - eight bits Word - typically four bytes Kilobyte (Kb) - 2**10 (1024) bytes (cache) Megabyte (Mb) - 2**20 bytes (memory) Gigabyte (Gb) - 2**30 bytes (disk) Terabyte (Tb) - 2**40 bytes (tape libraries)

Chapter 2: The Role of Performance - 7 of 13