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If you want to encrypt a USB stick or an external hard drive on your Apple Mac, you don't need a special app. Only an operating system from macOS 10.13 High Sierra is required. With this, as well as with one or two requirements that are still met, you can quickly and easily secure a data stick or a USB hard drive with a password. In the following I'll show you how to do it.
The fact that you need macOS 10.13 or newer is due to the fact that the stick to be encrypted or the hard drive is in the APFS- File format needs to be formatted. Only data carriers with this Apple format can be encrypted using the method described in the next paragraph. The best thing to do is to first copy all of the data on the storage medium to the Mac hard drive, format the data medium (here are instructions) and then encrypts it. The fastest way to do this is when it is empty. Depending on the number and size of the files on the stick or hard drive, the process may take longer. By the way, you should make a careful note of the password you have assigned - it cannot be reset.
If you have followed the instructions given above, the procedure is quite simple. You connect the desired USB stick or the external hard drive to the Mac, open the Finder and look for the data carrier in the left sidebar. Click on it with the right mouse button or use a "secondary click" and select the item "Encrypt XYZ ..." in the menu that appears - instead of "XYZ" there is of course the name of the device. Now you can set a password that you should remember well. Once the stick or hard drive is in APFS format and encrypted, you can only access it on Macs with macOS High Sierra, Mojave, Catalina or newer. You will always be asked for the password.
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Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.