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From Mac Kung Fu Over 400 Tips:


Whenever you empty the trash, the actual content of the files sticks around on the disk until it’s overwritten, and it can be recovered using one of the many third-party file recovery tools available.


To avoid this, you can securely empty the trash, which involves writing over the data with zeroes so that it can’t be recovered. simply click and hold the trash icon in the Dock until the context menu appears (or right-click the Dock icon). 휴지통 아이콘에서 오른쪽 클릭한 후 CMD 누르면 메뉴가 바뀜. Let go of the mouse button and then hold down the Command key. The menu will change to read Secure Empty Trash. Click to do so. it takes significantly longer than deleting unsecurely. With a very full trash can, it might take hours.


Note that if your Mac has a solid-state hard disk (SSD), such as those fitted to MacBook Air and Retina MacBook Pro computers, securely erasing files or the trash in the ways described next is ineffective and likely unnecessary because SSDs employ TRIM to clean up old data.1 The best method of protecting an SSD (or any kind of storage disk) from data snoops is to encrypt its contents.


- Always Emptying the Trash Securely

from Find preferences

01.png


- Wiping Individual Files

you can use the command-line tool srm to delete files and then overwrite the space with random data. srm is perhaps one of the most danger- ous commands available on your Mac, however, so use it carefully!


ex) srm /Users/User1/Desktop/file.txt

the command for deleting a directory would be srm -rfv


- Creating a GUI Secure Delete Tool

: 오른쪽 클릭시 secure delete function이 나오도록 (srm 사용)

start Automator

02.png 03.png 04.png 05.png 06.png 07.png 08.png


Note: 삭제는 /Users/User1/Library/Services에서 .workflow파일을 지운 후 재로그인


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