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Some files or folders are not easily deleted, particularly when they are locked or when you don't have write permission.

You can use this option to remove Trash contents for all accounts on all connected disks, regardless of privileges.



The Trash pane of the Files toolbar item allows you to securely delete the trash contents.

The Secure Delete (3 passes) option overwrites every byte of deleted contents three times (with 0xff, 0x00, and 0xff again).

The Secure Delete (7 passes) option meets the U.S. Department of Defense DoD 5220.22-M (ECE) standard, and writes over the data seven times (0xF6, 0x00, 0xFF, random data, 0x00, 0xFF, and random data).

Therefore, these operations take a very long time. Wait for the task to complete.

WARNING:
You should not perform the Secure Delete operations on a solid-state drive or a Fusion Drive because the operations can reduce the lifespan of those drives.
Moreover, because the internal controller can make data reallocations to manage the wear of the blocks, it is difficult to know if previous copies of data do not exist.