Mac storage basics · Disks, APFS and formats
Should I partition my Mac's internal drive?
Short answer: Usually not — partitions lock space at a fixed size. Add an APFS volume instead, which shares free space. Partition only when a drive needs two different formats.
Usually not. Partitions fix space at a set size, which wastes room on a Mac's internal drive. If you want a separate area — for a beta macOS, say, or to keep projects apart — add an APFS volume instead; it shares free space with the rest of the drive.
Partitioning makes sense mainly on external drives that need two different formats, such as APFS for a Mac and exFAT for Windows.