That’s because changing the partitions, by adding, removing, or resizing, resulted in the loss of all data on the volume. Before OS X Leopard, you needed to fully back up all the data on a drive if you intended to alter the drive’s partition map in any way. With the advent of OS X Leopard, Disk Utility picked up a much-prized feature: the ability to non-destructively resize existing volumes and partitions. It has been the go-to tool for formatting a Mac’s drives, erasing data, securely wiping information, and creating multiple partitions.
Disk Utility, the all-purpose tool for working with storage devices connected to the Mac, has long had the ability to create partitions and manage the resulting volumes.
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