DVD-RW
The DVD-RW standard was proposed by Pioneer in 1998 and received strong support from the DVD Forum, whose members include Apple, Hitachi, Manufacturers such as NEC, Samsung and Panasonic completed the formal standard of version 1.1 in mid-2000. DVD-RW products were initially positioned as consumer electronics products, mainly providing functions similar to VHS video tapes and recording high-quality multimedia video information for consumers. However, with the development of technology, the functions of DVD-RW have gradually expanded to the computer field. The DVD-RW recording principle is similar to that of ordinary CD-RW recording. It also uses phase change reading and writing technology, and it is also a fixed linear speed CLV recording method.
The advantage of DVD-RW is that it has good compatibility and can save data in DVD video format, so it can be played on a DVD player. However, its one big drawback is that formatting takes an hour and a half. In addition, DVD-RW provides two recording modes: one is called video recording mode; the other is called DVD video mode. The former mode has richer functions, but is not compatible with DVD players. Users need to choose between these two formats, which is not very convenient to use.
DVD+RW
DVD+RW is currently the easiest to use and most compatible with existing formats DVD burning standard, and it is also cheap. The DVD+RW standard was jointly developed by Ricoh, Philips, Sony, Yamaha and other companies. These companies established an industrial organization called the DVD+RW Alliance. DVD+RW is currently the only rewritable format that is fully compatible with existing DVD players and DVD drives, that is, fully compatible with real-time video recording and subsequent data storage in computer and entertainment applications. DVD+RW can not only be used as data storage for PC, but also can directly burn video information in DVD video format, which is a major breakthrough in the DVD industry. With the development and popularity of DVD+RW, DVD+RW has become a rewritable DVD standard that closely integrates DVD video and DVD recorders on PCs.
Features of DVD+RW:
Single-sided capacity 4.7GB; double-sided capacity 9.4GB
The maximum recording time on one side is 4 hours of video; dual-sided Surface for 8 hours
Laser wavelength 650 nm, same as DVD video
Constant linear velocity data density
CLV and CAV burning
UDF (Universal Disk Format, Universal Disk Format) file system
Quick format
Sequential burning or random burning
No loss of links (several burning It will not waste disk space)
The finished product is burned, and all physical parameters comply with DVD-ROM specifications
DVD+RW has the ease of use of DVD-RAM optical drive, and has improved DVD-RW drive compatibility. Although the formatting time of DVD+RW takes about an hour, since the formatting can be carried out in the background from the middle, data can be burned in one minute, making it the fastest practical DVD burner. . At the same time, the DVD+R/RW standard is currently the only DVD recording standard supported by Microsoft.
DVD Dual
The DVD-Dual specification, also known as the DVD-Dual RW standard, was designed and first implemented by Sony Corporation. Manufacturers including SONY, NEC, etc. have proposed the new specification DVD Dual, which is the design of DVD±R/RW, in response to the problem of incompatibility between DVD-R/RW and DVD+R/RW. DVD Dual does not have unified specifications like DVD Multi, allowing manufacturers to play freely. DVD±RW recorders are compatible with both DVD-/RW and DVD+ RW specifications, so users don’t have to worry about matching DVD recording discs.
However, the DVD Dual recorder also has a small disadvantage, that is, it needs to pay two patent fees, the production cost will increase, and the price will naturally be a bit more expensive. In contrast, since DVD-RAM and DVD-R/RW belong to the official DVD forum, they have an advantage in this aspect (licensing fees). Currently, most Japanese, European and American manufacturers focus on DVD-Multi, and most Taiwanese manufacturers focus on DVD-Dual.
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