Instead, a partition is just a part of a disk with a specific size, which is set at the time of creation. It doesn’t necessarily contain a file system, and it might not be formatted to store data. Even system programs like macOS’ Disk Utility don’t distinguish between the unformatted partition and the formatted volume. But if we want to get precise, a “partition” is a chunk of a disk. In fact, the two terms are used almost interchangeably. PartitionĪ partition is very much like a volume. Examine the disks attached to a Unix system, and you’ll see specifications like “disk1s2.” That specifies the parent disk (“disk1”) and the partition/volume number (“s2”) within the disk. A disk is like the parent container for all the logical divisions of storage that might come below it. Disks contain volumes and can contain multiple volumes of different sizes. “Disk” is the word used by Unix systems to refer to physical storage devices.
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