Why deleting files does not free up space on mac

Force "Purgeable Space" to Be Released is a terminal-based method to resolve the issue where deleting files does not free up space mac.

macOS sometimes marks space as "purgeable" — meaning it’s available but not yet reported as free. You can force it to release this space using a simple two-step process in Terminal:

# Step 1: Create a large temporary file to fill space, triggering purge
dd if=/dev/zero of=~/Desktop/tempfile bs=1m count=5000

# Step 2: Delete the temporary file
rm ~/Desktop/tempfile

This action pressures macOS to immediately free up all purgeable space.

Notes

• Use this command with caution: If used improperly, `dd` may overwrite data, so be sure to use the exact path `~/Desktop/tempfile`.
• Ensure you have at least 5GB of available space to avoid running out of disk space during the process.
• Close other applications before running the command to prevent system crashes or data loss due to insufficient disk space.
• The temporary file will occupy approximately 5GB of space during the process; it will be deleted immediately after completion.
• This method only frees up cleanable space and does not affect other types of occupied storage space.

This terminal trick is a quick, no-extra-tools way to resolve the common macOS problem of deleting files does not free up space mac, and it works without needing to use external drives or system utilities.