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  Name:     disksize() - get a disks size in bytes
  Usage:    <integer> = disksize([<disk>])
  Params:   string <disk> - the disk to check, optional - if none
            then the default is the currently logged disk
  Returns:  an integer equal to the disks size

 ---------------------------------- Example ---------------------------------

                 mem1 = disksize("C:")
                 if mem1 < 10000000
                      ? "You should buy a bigger hard disk"
                 endif

  Note:          This function sets ferror() if an error occurs.