August 14, 2026
the money Finder lends you
Why macOS claims capacity it hasn't freed yet, how thinnables release on demand, and what this means buying drives.
- Difficulty: Advanced
- Time: Eighteen minute read
DH-00 · Department
Where big files live after the internal drive fills up. Inventory pass completed August 14, 2026, carrying 2 worked fiches.
Internal storage stopped growing about the time photo libraries learned to shoot video, so offloading became permanent household infrastructure rather than an emergency measure. This department covers the arithmetic of purgeable space and the craft of moving libraries intact.
Format choices, relocation commands, tethered-versus-portable duty assignments and verification rituals all appear in plain prose, because hardware mistakes cost more than any software subscription ever quoted.
Why macOS claims capacity it hasn't freed yet, how thinnables release on demand, and what this means buying drives.
Formatting choices, library relocation care, launch-key discipline and verification habits for offload duty.
Reading order. Purgeable space explains most availability confusion; start there before buying anything.