PartitionMagic is a computer program for hard disk drive partitioning originally made by the PowerQuest corporation but now owned by Symantec. The program runs on Microsoft Windows operating systems (only 2000 and XP, not Vista) or from a bootable CD-ROM and enables creation and modification of partitions. Existing partitions can be resized without loss of data.
PartitionMagic is capable of resizing NTFS or FAT (16 or 32) partitions without data loss, and can copy and move partitions, including to other disks. It also has various other features, including being able to convert between FAT16, FAT32 and NTFS, modify the cluster size of FAT16/32 and NTFS filesystems, and merge adjacent FAT or NTFS filesystems (all without data loss, though some NTFS-only metadata is lost on conversion to FAT). Additionally, it has somewhat limited support for ext2 and ext3 partitions.
PartitionMagic releases 1–3 were offered both in OS/2 and Windows versions. Symantec's PartitionMagic version 8 only supports Windows.