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* In the metric system the "k" or "kilo" prefix is always lowercase (i.e. kilogram = kg not Kg) but since these binary uses for data storage capacity are not properly metric, it has become standard to use an uppercase "K" for the binary form.  Although data storage capacity is generally expressed in binary code, many hard drive manufacturers (and some newer BIOSs) use a decimal system to express capacity.  For example, a 30 gigabyte drive is usually 30,000,000,000 bytes (decimal) not the 32,212,254,720 binary bytes you would expect.  When used to describe data transfer rate or bandwidth, bits and bytes are calculated as in the metric system.  For example one kilobit is 1000 bits not 1024 bits. Additionally, kilobits per second is usually shortened to kbps or Kbps. Although technically speaking, the term kilobit should have a lowercase initial letter, it has become common to capitalize it in abbreviation (e.g. "56 Kbps" or "56K"). The simple "K" might seem ambiguous but, in the context of data transfer or Internet bandwidth speed, it can be assumed that the measurement is in bits rather than bytes unless indicated otherwise. T1 Shopper recommends using the abbreviation KB for kilobyte or the new IEC International Standards which were approved December 1998.