DVD+R is an optical write-once disc format specification made to directly compete with DVD-R. It is supported and maintained by these manufacturers of the DVD+RW Alliance but not limited to this scope and also subject to change: Philips, Hewlett-Packard, Mitsubishi, Sony, Ricoh and Yamaha. DVD+R was introduced in 2002 - after its rewritable cousin (DVD+RW), which typically bucks the trend in technical chronology.
DVD+R engaged in the format war for dominance and support in the industry with DVD-R. The difference between the formats rests in the disc's individual tracking systems and speed control (ADIP for DVD+R and LPP for DVD-R).
Another functional difference between the formats is in how they manage defects. The DVD Forum - the industry's premier association - did not accept DVD+R as an official format until 2008. A winner between the two formats can still be debated, and some of the industry's technology has created dually-compatible accessories to accept both formats, such as hybrid drives.
DVD+R shares many similarities with DVD-R, and the differences to users could be negligible unless confronted with compatibility issues. The likeness in data capacity is close to identical in terms of the gigabyte breakdown at 4.7GB for a single layer disc and 8.5GB for a double layer disc.
DVD+R is a dye-based recording medium. The disc itself consists of several layers. There are two polycarbonate substrate layers, one serves as a protective "dummy" layer, while the other contains the microscopic pits that encode the binary data. The drive's laser imprints the dye-based recording layer. There is also a transparent adhesive layer for the laser's readability of the data.
The plus format functions at a higher frequency than its dash format competitor. It uses an ADIP (Address in Pregroove) disc system which controls how the laser is guided and the speed with which it operates in the drive. This system is praised for withstanding electrical noise and disc tilting.
Another advantage to DVD+R is its system of lossless link which gives the user the best use of their recording time. Lossless linking is able to reduce the number of empty data areas between recording sessions.
DVD+R has a backwards compatibility with drives and players at approximately 85%. Its high storage capacity is suited for a variety of consumer and business applications. Finalizing a DVD+R - which will prevent further recording sessions - takes just one minute per disc compared to approximately fifteen minutes for DVD-Rs.
Be sure to check out our pages on these other DVD formats:
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