Why Do DVDS Become Corrupted or Unplayable?

When DVDs first became popular, many of us were told they would last a lifetime. They were promoted as a safer, more durable alternative to VHS tapes, and countless families transferred their home videos onto DVD before throwing the original tapes away.

Fast forward twenty years, and many people are discovering that some of those DVDs no longer play. They freeze, skip, refuse to load or are not recognised at all.

So why does this happen? Can anything be done to recover the videos? And is DVD still a good long-term way to preserve family memories?

Couple this with the fact that DVD drives have all but disappeared from new computers and fewer people now own DVD players, and you have to question whether DVDs are still a suitable way to store your family memories without also having a backup on a USB drive or in secure cloud storage.

Adhesive Labels on the DVD

This is one of the biggest problems we see with DVDs.

Many DVDs were given an adhesive paper label showing a title or the name of the company that transferred the footage to the disc. It seemed like a good idea at the time.

Over the years the paper and adhesive can shrink, causing the disc to warp. Even a slight distortion can prevent a DVD player or computer drive from reading the data correctly because the laser can no longer maintain its focus.

The disc may have played perfectly ten years ago but no longer works today.

To recover the files, the disc usually needs to be returned as closely as possible to its original flat shape using specialist techniques. In many cases most, if not all, of the original videos can be recovered. If the disc has become severely warped, however, recovery is not always possible.

It took me a while to realise what was happening. I kept receiving DVDs that simply wouldn't play, and eventually noticed that almost every one had a full-size adhesive paper label. As the label aged and shrank, it slowly warped the disc.

Over time, I developed techniques to gently flatten some of these discs long enough to recover the data. Sometimes I only had a short window before the disc began to warp again, so the recovery had to be done quickly. Fortunately, in many cases, it was enough to rescue the family videos.

If you have DVDs with full-size adhesive labels, it is worth having them copied sooner rather than later.

Low Quality Recordable DVDs

Bending a DVD, even slightly, can cause permanent damage.

This might happen when removing it from its case, storing it incorrectly or placing heavy objects on top of it. Discs should always be stored vertically in their cases like books on a shelf.

Long-term horizontal storage, particularly in warm conditions, can cause a disc to become permanently bowed. Although the data may still be present, the laser may no longer be able to follow the data track accurately.

Disc Flexing

Bending a DVD, even slightly, can cause permanent damage.

This might happen when removing it from its case, storing it incorrectly or placing heavy objects on top of it. Discs should always be stored vertically in their cases like books on a shelf.

Long-term horizontal storage, particularly in warm conditions, can cause a disc to become permanently bowed. Although the data may still be present, the laser may no longer be able to follow the data track accurately.

Scratches on the Laser-Reading Side

Scratches affect DVDs differently depending on their depth and direction.

Light scratches often have little effect because the laser focuses beneath the plastic's surface. Modern DVD drives also include error correction that can compensate for minor damage.

However, deep scratches or multiple scratches close together can overwhelm the error correction system. Scratches that run along the data track are particularly problematic because they can prevent the drive from reading data correctly.

If a scratch is deep enough to damage the recording layer itself, the missing data cannot be recovered.

Moisture

Although DVDs appear waterproof, the materials inside can absorb moisture.

Exposure to spills, flooding or prolonged humidity may allow moisture to penetrate the disc. If the disc is simply damp, allowing it to dry slowly in normal room conditions may restore normal operation.

However, contaminated water can leave behind minerals or other residues that permanently damage the recording layer.

Direct Sunlight & Heat

High temperatures are one of the biggest enemies of optical discs.

Leaving DVDs in direct sunlight, on a windowsill, on a car dashboard or near a radiator can quickly damage the recording layer and permanently warp the disc.

Even if the disc is inside its case, prolonged exposure to heat can still make it unreadable.

The Disc is Not Finalised After Recording

Many DVDs recorded on home DVD recorders or computers need to be finalised before they can be played on other devices.

Until this final step is completed, the disc may only work on the machine that created it.

Once finalised, the directory information is permanently written to the disc, making it compatible with most DVD players and computer drives. If a recording session was never finalised, the disc may appear blank or unreadable even though the video is still present.

Fingerprints, Smudges, Dirt, and Dust

Fingerprints, smudges, dust and dirt can interfere with the laser far more than many people realise.

Unlike scratches, these marks are usually easy to remove. Cleaning the disc carefully with a soft, lint-free cloth, wiping from the centre outwards rather than in circles, can often restore playback.

Dust can also find its way into DVD drives, reducing their ability to read discs accurately.

Final Thoughts

There are several reasons why DVDs become corrupted or unplayable, but these are among the most common.

The important thing is not to assume your family videos have been lost simply because a DVD no longer plays in your computer or DVD player. In many cases, the footage can still be recovered using specialist equipment and techniques.

If your DVDs contain precious family memories, it is worth checking that they still play and copying them to modern digital storage before further deterioration occurs. You can also find out more about our Digital Disc Transfer Service, which helps recover and preserve videos from ageing DVDs before they are lost.