A utility for hard drive organization from Symantec Corporation, Cupertino, CA (www.symantec.com) that allows disk partitions to be changed on the fly without destroying existing data. By making multiple smaller drives out of a large one, their cluster sizes are lowered and waste less space.

Officially called "Norton PartitionMagic," this highly praised product runs in Windows and supports FAT (DOS, Windows 95, 98 and ME), NTFS (Windows NT, 2000, XP) and EXT 2/3 (Linux) File Systems. Without a product like this, the DOS Fdisk utility is used to repartition a hard disk, and all data are lost in the process. PartitionMagic was originally introduced in 1995 by PowerQuest Corporation, Orem, UT, a company acquired by Symantec in 2003. See partition.