By using the format command from the command line without specifying a cluster size.Windows XP uses default values if you format a volume as NTFS by either of the following methods: If you do not specify a cluster size for formatting, Windows XP Disk Management bases the cluster size on the size of the volume. The smaller the cluster size, the more efficiently your disk stores information. All file systems that Windows XP uses to organize the hard disk are based on cluster (allocation unit) size, which represents the smallest amount of disk space that can be allocated to hold a file.
