What is a Disk Cluster?

Also known as “allocation units”, clusters are essentially units of disk space as defined by a file system like FAT32 or NTFS during the partition formatting process. When files are saved to disk, they are stored in as many clusters as necessary to save the complete file. For example, if an NTFS partition is configured with a 4 K cluster size, a 32 K file would be saved using a total of 8 clusters. When a disk is defragmented, files are saved to contiguous disk clusters.

Author: Dan DiNicolo

Dan DiNicolo is a freelance author, consultant, trainer, and the managing editor of 2000Trainers.com. He is the author of the CCNA Study Guide found on this site, as well as many books including the PC Magazine titles Windows XP Security Solutions and Windows Vista Security Solutions. Click here to contact Dan.