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| DVD Knowledge Base 27 - Is it ok to put labels or magnetic strips on DVDs? |
It depends on the label. If a label or adhesive strip is heavy enough it can unbalance the disc and cause read errors or slow down the disc speed. This is especially a problem with magnetic strips for library or rental store security. As DVD-ROM drives get faster and faster, an unbalanced becomes more critical. DVD players and drives are designed to compensate for unbalanced discs, so a thin, light label is usually ok. Pressure-sensitive adhesives break down over time, or may be weak to begin with, so it's possible for a label to come loose while the disc is spinning and damage the player or drive. The best option is a ring-shaped "donut" label that goes around the center of the disc. As long as the circular label doesn't interfere with the player clamping onto the hub, it should be ok. If you have to use a non-circular sticker, place it as close to the center as possible to minimize unbalancing. Placing a second sticker straight across from the center will also help. High-adhesion labels are best.
Writing with a marker in the clear (not reflective) area at the hub is better than using a sticker, although there's not much room to write. It's best to write inside a 44-mm diameter, since writing elsewhere with certain kinds of inks could possibly eat away the protective coating and damage the data layer underneath.
In most cases a better alternative for security is a case that can only be opened with special equipment at the register or checkout counter. Barcodes, stickers, and security strips can be placed on the case without endangering discs (or players). This is especially good for double-sided discs, which have no space for stickers.
There are full-size round labels designed to go on recordable CDs and DVDs, but they have been known to cause problems, especially if not applied smoothly and straight. A better (but more expensive) solution is to use an inkjet disc printer (IMT, Odixion, Primera, Rimage, Trace Affex) with printable-surface discs. Some drives have the HP LightScribe feature, where if you have software that supports LightScribe, and you use special LightScribe discs with a photosensitive side, after you record the disc you can put it back in the drive upside down to "etch" a label on the disc.
If you do use adhesive paper "donut" labels, it's best to get one of the devices that helps you center the label on the disc. Worldlabel.com has free templates for printing on CD and DVD adhesive labels.
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