What Is a DVD? Types, Capacity, and Backup Options

You've probably seen DVDs on store shelves or in old media libraries, but have you ever stopped to ask: what exactly is a DVD? A DVD is an optical format designed to hold far more data than its predecessor, the CD (Compact Disc). While DVDs once dominated home entertainment, streaming services now carry much of that load. If you still own a DVD collection, it's wise to think about backing it up and protecting it. In this article I'll walk through what a DVD is, how it differs from a CD, and how you can back up even protected discs to keep your media safe for years to come.

What is a DVD?

A DVD (Digital Versatile Disc, also commonly called Digital Video Disc) is a 12 cm optical disc format for storing digital video, software, and computer data. A standard single-layer DVD holds about 4.7GB, while a dual-layer DVD holds about 8.5GB. It looks similar to a CD, but it stores data more densely, so it can carry full-length DVD-Video content and larger files.

DVD data is stored as microscopic pits and lands arranged in a spiral track inside clear polycarbonate plastic. A red laser in a DVD player or drive reads those marks and converts them back into video, audio, files, or software instructions. The most important limitation is that a DVD needs DVD-capable hardware, such as a DVD drive; a CD player cannot read a DVD.

DVDs became common because they offered far more space than CDs without changing the familiar disc shape. Understanding what a DVD is helps you choose an authorized DVD backup that preserves either the full disc structure or the content you want to play.

CD, DVD, and Blu-ray: Key Differences

Once you understand what DVD stands for, the difference between CD, DVD, and Blu-ray becomes easier to see. All three are optical discs, but they use different data densities, laser technology, capacity levels, and playback hardware.

A DVD is not simply a larger CD. It uses tighter tracks and different reading requirements, which is why CD-only players cannot play DVD movies. A Blu-ray disc goes further with higher capacity and higher typical video resolution, but it also needs Blu-ray-capable hardware. Among the three, DVD occupies the middle ground between CD capacity and Blu-ray capacity.

Overview of DVD Types and Their Uses

DVDs are available in several formats. The letters used in DVD formats matter because they tell you whether the disc is factory-pressed, recordable once, rewritable, dual-layer, or intended for a more specialized device.

For a simple rule of thumb, choose DVD-ROM for factory-made read-only content, DVD-R or DVD+R for write-once storage, and DVD-RW or DVD+RW when you need to erase and reuse the disc. Choose dual-layer media only when your burner and playback device support it and the project is larger than a single-layer DVD.

DVD Backup Options with DVDFab DVD Copy

Before using a dedicated tool, separate DVD backup into three common cases. For an ordinary data DVD, you can often copy DVD files to a computer or USB drive with File Explorer or Finder. For a home-authored video DVD, you may save the disc structure as a VIDEO_TS folder or ISO image with compatible disc software. For any backup, use only content and access you are authorized to use, keep the copy for personal use, do not redistribute it, and follow applicable US law and relevant terms.

DVDFab DVD Copy is a DVD backup tool that can copy both protected and unprotected DVDs. Its handles common protection systems such as CSS, RC, RCE, APS, and Sony DADC, allowing you to create playable backups without errors. Its GPU acceleration and batch processing enables you to copy large collections efficiently.

How to Use DVDFab DVD Copy to Back Up Your DVD

Step 1: Download and Install DVDFab

Free download and install DVDFab on your computer. You can obtain it from the official website or click the download button below.

Step 2: Load the DVD Source

Once installed, open the program and switch to the Copy module. Insert the DVD into your optical drive. The software will detect the disc automatically in many cases. You can also click "+" to load the disc manually, or drag and drop an ISO/DVD folder into the main interface.

Step 3: Choose a Copy Mode and Customize the DVD

Select a copy mode based on your goal. For example, Full Disc keeps menus and extras, while Main Movie focuses on the main title. Clone/Burn preserves the original audio and video data in a 1:1 copy, while DVD-9-to-DVD-5 compression re-encodes the content to fit the smaller disc; choose DVD-9 output when you want a 1:1 copy. You can also select specific chapters, audio tracks, and subtitles. For content you are authorized to access, save the backup locally as an ISO image or VIDEO_TS folder.

Step 4: Start Copying

After confirming the output location and copy mode, click the "Start" button. Progress and remaining time are displayed, and you can pause or cancel the task if needed. 

The Bottom Line

A DVD is more than just a movie disc. It's one of the most influential forms of optical storage in digital history. It bridged the gap between physical and digital media, offering a durable and affordable way to preserve data and entertainment. Even as streaming dominates today's media landscape, understanding what a DVD is and how to keep your collection usable remains valuable. DVDFab DVD Copy creates DVD, ISO image, or VIDEO_TS folder backups. DVDFab DVD Ripper converts DVD titles to MP4 or MKV files.