What is the most commonly used digital device in cameras to save video?

The most commonly used digital device in cameras to save video is the SD card. SD cards, or Secure Digital cards, are compact flash memory cards that are widely used in various electronic devices, particularly in digital cameras, camcorders, and smartphones. Their popularity stems from their small size, high storage capacity, and quick read/write speeds, making them ideal for recording high-quality video.

While USB drives and hard disks can also store video, they are less frequently used directly in cameras. USB drives are often used for transferring files rather than as primary storage media in the cameras themselves. Hard disks, although they provide substantial storage, are bulkier and not practical for handheld devices like cameras. Flash drives are similar to USB drives in that they can be used for file storage, but they do not typically serve as the main video storage method in cameras. SD cards are the industry standard for this purpose due to their wide compatibility and reliability.