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삭제 옵션

From the Finder, when you delete a file and empty the Trash, the file is not really deleted. Instead, only the directory entry for the file is removed, but the file's data remains on the drive.

From the Erasing pane in the Files toolbar item, this option permanently erases the selected file or the folder and its contents using powerful algorithms. This operation is irreversible, and the erased items are not recoverable even with an undelete tool.

1 번, 0으로 쓰기
This option overwrites with binary zeros (0x00).

1번, 임의 데이터 쓰기
This option overwrites with a single pass of random data.

3번, 지우기 전 3번 덮어쓰기
This option overwrites regular files before deleting them. Files are overwritten three times, first with the byte pattern 0xff, then 0x00, and then 0xff again, before they are deleted.

7번, 미 국방부 표준 알고리즘
This option meets the U.S. Department of Defense DoD 5220.22-M (ECE) standard for securely erasing magnetic media. It erases the information used to access your files and writes over the data seven times (0xF6, 0x00, 0xFF, random data, 0x00, 0xFF, and random data).

35 번, Peter Gutmann 알고리즘


경고:
You should not perform these 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.