What is the main function of disk-based camcorders?

The primary function of disk-based camcorders is to store video on a hard drive or disk. This design allows for more flexibility in storing and retrieving video content, as well as providing greater storage capacity compared to traditional tape-based systems. This method of storage enables users to quickly access footage for editing or playback without the linear limitations of tape, facilitating a more efficient workflow in video production.

In contrast, shooting video using a spinning tape refers to a different technology that relies on magnetic tape, which is not the characteristic of disk-based camcorders. The requirement of external storage devices is not a defining feature, as these camcorders typically have built-in storage capabilities. Lastly, while some camcorders may have the added function of capturing photographs, their primary design and function are centered around video recording.