Why cannot I lock folders larger than 4 GB?

You use the FAT32 file system. The NTFS files system does not have this limitation. To find out the file system type you use, right-click the drive in Windows Explorer and select Properties from the right-click menu.

Unfortunately, the FAT32 file system does not allow Password Protect Folders to lock folders exceeding 4 GB. The only solution is to divide the folder into some parts and move the files that do not need protection into a separate folder.

Also, when protecting a large folder, please note that you need free space on the drive as the program creates temporary files, which are removed when the process is completed. This is a safety feature designed to prevent data loss if a power outage or another problem occurs. What amount of space is required depends on the folder size and the number of files and subfolders in the folder; in general, you may need twice as much space as the folder takes or less.

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