How to permanently delete files on mac without any chance of recovery

Reinstalling macOS represents the most thorough security measure for Mac devices, achieving permanently delete files on mac by fully erasing the disk prior to system reinstallation. This approach is ideal for scenarios requiring complete data clearance—such as device transfer, sale, or disposal—and constitutes the most definitive solution for irreversible file removal.

Step 1: Preliminary Preparations

1. Ensure your Mac is connected to a stable power source to prevent system damage from power loss during reinstallation

2. No data backup is required; transfer any necessary files to external storage beforehand.

Step 2: Data Erasure

1. Restart your Mac, press and hold the Cmd+R keys immediately upon startup, releasing them only after the Apple logo/recovery interface appears.

2. Disk erasure:

   Within the recovery interface, select Disk Utility and click Continue;

   Select your Mac's system startup disk from the left pane.

   Click Erase at the top, select 7-pass Secure Erase in the erasure settings, then confirm erasure.

   After disk erasure completes, close Disk Utility and return to the main recovery interface.

3. Within the Recovery interface, select Reinstall macOS and follow the prompts to complete the process, ensuring a stable internet connection throughout.

4. Following reinstallation, your Mac will be in a fresh system state. Simply complete the guided basic setup process.

Final outcome

• The fresh macOS system ensures all original data, apps, and settings on the device are completely erased, achieving the ultimate effect of permanently delete files on mac.