As the title suggests, "Dual" (or "double") layer DVDs have two recording layers to allow a maximum storage capacity of 8.5GB per disc. Dual Layer DVDs are relatively new and are more expensive than single layer DVDs- because of this they're supplied in single units or packs of 10 DVDs. (However, prices have fallen a lot recently, and they are now relatively affordable). There are two types of DVD dual layer discs; both types can only be written to once.
 Most DVD recorders built since 2005 will support Dual Layer DVD+R ("Dual Layer plus R") burning, but you're advised to check before buying. (Check your drive for the "double rectangle" DVD+R DL logo as shown on the left). These DVDs can only be written to once. Most dual layer discs we sell are DVD+R DL.
 DVD-R DL is the "DVD-R" group's answer to DVD+R DL. It is basically the same idea, but is a much newer (and rarer) format than DVD+R. Because of this, it is only supported by fairly recent drives, and we recommend that you check that your drive is capable of burning it. Look for the DVD-R DL logo (shown on the left) on your drive.
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