From Mac Guides
Disk Utility performs a variety of functions, including:
- Repairing permissions
- Repairing disks
- Creating disk images
- Disk formatting, partitioning and RAID
- Burning disk images
- Restoring a disk from a disk image
Disk Utility can format disks on your computer. If the disks are formatted in FAT32 format they can be used easily with a Mac and a PC, there is no 32GB partition limit for this as on Windows as that is an artificial restriction, however files over 4GB cannot be used with it. HFS+ Extended (Journaled) is the default format for disks on the Mac.
Prior to Mac OS X 10.3, Disk Utility's functionality was split over two applications, Disk Copy and Disk Utility. In older versions of Mac OS, disk verification features were located in Disk First Aid.