How to Prevent Other Laptops Using Backups Stored in an External Hard Disk

Step-by-Step Guide

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   Step 1: Open your disk utility.

   This can be found in Menu > Others > Disk Utility. , Connect your pendrive or any other flash drive. ,,, One shows the format in which your flash drive is formatted (FAT32 , NTFS , Mac Journaled, etc.).
   
   The other bar shows the name of your pen drive. , A dropdown menu will show pen drive formats.
   
   Select "Mac journaled, encrypted."
   
   It will ask you to create a password.
   
   Do that, then create a hint to help you remember the password. ,,
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   Step 2: Open the disk utility app.

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   Step 3: From the left-hand side choose the disk you want to secure or encrypt.

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   Step 4: On the right-hand side

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   Step 5: click on Erase (located on top).

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   Step 6: Look for two bars just below it.

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   Step 7: Click on your pen drive.

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   Step 8: At the bottom click on the Erase tab.

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   Step 9: Click on Erase.

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    Step 10: After the process is completed you'll have a secured flash drive.

Detailed Guide

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