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DVR with built-in DVD recorder.
DVR with built-in DVD recorder.
"DVDR" redirects here. This article is about DVD disc recorders in general. For other uses of "DVDR", including the Philips DVDR ('N1500') video format, see DVDR (disambiguation).

A DVD recorder (or DVDR, more commonly known in the UK and Ireland as the DVD recorder), is an optical disc recorder that records video onto blank writeable DVD media. In Computing, an optical disc drive ( ODD) is a Disk drive that uses Laser light or electromagnetic waves near the Light spectrum DVD recordable and DVD rewritable refer to DVD Optical disc formats that can be recorded (written "burned" either write once Such devices are available as either installable drives for computers or as standalone components for use in studios or home theatre systems.

As of March 1, 2007 all new tuner-equipped television devices manufactured or imported in the United States must include digital tuners. The United States of America —commonly referred to as the An ATSC tuner, often called an ATSC receiver or HDTV tuner, allows reception of ATSC Digital television (DTV signals broadcast The US Federal Communications Commission has interpreted this rule broadly so as to include apparatus such as computer video capture cards, videotape recorders and standalone DVD recorders. Video capture is the process of converting an Analog video signal—such as that produced by a video camera or DVD player—to digital form VTR redirects here For other meanings see VTR (disambiguation. NTSC DVD recorders are therefore undergoing a transformation, either adding a digital ATSC tuner or removing over-the-air television tuner capability entirely. NTSC ( National Television System Committee) is the Analog television system used in the United States, Canada, Japan, Mexico An ATSC tuner, often called an ATSC receiver or HDTV tuner, allows reception of ATSC Digital television (DTV signals broadcast [1]

Contents

Technical information

Originally, DVD recorders supported one of three standards: DVD-RAM, DVD-RW (using DVD-VR), and DVD+RW (using DVD+VR), none of which are directly compatible. DVD (also known as " Digital Versatile Disc " or " Digital Video Disc " - see Etymology)is DVD-RAM ( DVD – Random Access Memory) is a disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate A DVD-RW disc is a rewritable Optical disc with equal storage capacity to a DVD-R, typically 4 The DVD-VR standard defines a logical format for video recording on DVD-R, DVD-RW, and DVD-RAM style media including the Dual layer versions DVD+RW is the name of a standard for Optical discs one of several types of DVD, which hold up to about 4 The DVD+VR standard defines a logical format for DVD-Video compliant recording on optical discs As a general rule, however, most current drives support both the + and - standards, while few support the DVD-RAM standard, which is not directly compatible with standard DVD readers. DVD-RAM ( DVD – Random Access Memory) is a disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate

Recording speed is generally denoted in values of X (similar to CD-ROM usage), where 1X in DVD usage is equal to 1. CD-ROM (an initialism of "Compact Disc Read-Only Memory " is a pre-pressed Compact Disc that contains data accessible to but not writable 321 MB/s, roughly equivalent to a 9X CD-ROM. In practice, this is largely an issue confined to computer-based DVD recorders, since standalone units generally record in real time, that is, 1X speed.

DVD recorders use a laser (usually 650 nm red) to read and write DVDs. A laser is a device that emits Light ( Electromagnetic radiation) through a process called Stimulated emission. A nanometre ( American spelling: nanometer, symbol nm) ( Greek: νάνος nanos dwarf; μετρώ metrό count) is a The reading laser is usually not stronger than 5 mW, while the writing laser is considerably more powerful. The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. The faster the writing speed is rated, the stronger the laser is. DVD burner lasers often peak at about 100-400 mW in continuous wave (some are pulsed). Some laser hobbyists have discovered ways to extract the laser diode from DVD burners. Dioden2jpg|thumb|right|150px|Figure 2 Various semiconductor diodes [1]

Computer-based DVD drives

Further information: Optical disc drive

DVD recorder drives have become standard equipment in many, though not all, computer systems currently on the market, after being initially popularized by the Pioneer/Apple SuperDrive; aftermarket drives as of early 2007 can cost as little as $23 [2]. In Computing, an optical disc drive ( ODD) is a Disk drive that uses Laser light or electromagnetic waves near the Light spectrum ( is a Multinational Corporation that specializes in digital entertainment products based in Tokyo, Japan. Apple Inc, ( formerly Apple Computer Inc, is an American Multinational corporation with a focus on designing and manufacturing Consumer electronics SuperDrive is a trademark used by Apple Inc for two different storage drives from 1988–1999 to refer to a high-density Floppy disk drive capable of reading all DVD recorder drives can be used in conjunction with DVD authoring software to create DVDs near or equal to commercial quality, and are also widely used for data backup and exchange. DVD authoring is the process of creating a DVD video that can be played on a DVD player. As a general rule, computer-based DVD recorders can also handle CD-R and CD-RW media; in fact, a number of standalone DVD recorders actually use drives designed for computers. A CD-R ( C ompact D isc- R ecordable is a variation of the Compact Disc invented by Philips and Sony. Compact Disc ReWritable (CD-RW is a rewritable Optical disc format

Most internal drives are designed with parallel ATA interfaces, with serial ATA becoming more readily available. AT Attachment with Packet Interface ( ATA/ATAPI) is a standard interface used to connect storage devices such as Hard disks Solid-state External drives almost always use USB 2.0 or IEEE 1394. The IEEE 1394 interface is a serial bus Interface standard for high-speed communications and Isochronous real-time data transfer frequently

DVD recorder drives are required to respect DVD region codes when reading a disc, but do not impose a region code on written discs unless the code has specifically been written into the disc's content. DVD video discs may be encoded with a region code restricting the area of the world in which they can be played

DVD duplication systems are generally built out of stacks of these drives, connected through a computer-based backplane. A backplane (or "backplane system" is a circuit board (usually a Printed circuit board) that connects several connectors in parallel to each other so

Standalone DVD recorders

When the standalone DVD recorder first appeared on the Japanese consumer market in 1999, these early units were very expensive, costing between $2500 and $4000 USD. For a topic outline on this subject see List of basic Japan topics. Year 1999 ( MCMXCIX) was a Common year starting on Friday (link will display full 1999 Gregorian calendar) The United States dollar ( sign: $; code: USD) is the unit of Currency of the United States; it has also been However, as of early 2007, DVD recorders from notable brands are selling for US$200 or €150 and less, with even lower "street prices". Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Early units supported only DVD-RAM and DVD-R discs, but the more recent units can record to all major formats DVD-R, DVD-RW, DVD+R, DVD+RW, and DVD+R DL. DVD-RAM ( DVD – Random Access Memory) is a disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD-R is a DVD recordable format A DVD-R typically has a storage capacity of 4 DVD-R is a DVD recordable format A DVD-R typically has a storage capacity of 4 A DVD-RW disc is a rewritable Optical disc with equal storage capacity to a DVD-R, typically 4 A DVD+R is a once-writable Optical disc with 47 GB (4377 GiB) of storage capacity (more precisely 2295104 sectors of 2048 Bytes DVD+RW is the name of a standard for Optical discs one of several types of DVD, which hold up to about 4 DVD+R DL (DL stands for Double Layer) also called DVD+R9, is a derivative of the DVD+R format created by the DVD+RW Alliance. Some models now include hard disk-based digital video recorders (DVRs) to improve ease of use. A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device A digital video recorder ( DVR) or personal video recorder ( PVR) is a device that records video in a digital format to a Disk drive or other Standalone DVD recorders generally have basic DVD authoring software built in; however, the appearance of the finished DVD is very basic and usually completely under the control of the unit. DVD authoring is the process of creating a DVD video that can be played on a DVD player.

Some believed that DVD recorders would supersede the VCR as the standard television-recording device; however, with the rise of DVR's and competing media formats like Blu-ray, the DVD recorder's future seems limited. PLEASE BEAR IN MIND THAT THIS IS A GENERAL ARTICLE ABOUT VCRs/VIDEOCASSETTE RECORDERS

DVD recorders have several technical advantages over VCRs, including:

However, an inconvenience exists in which DVDs recorded with DVD recorders must be finalized to view in other DVD players. Generation loss refers to the loss of quality and potential increase of file size between subsequent copies of data Finalizing (also spelled finalising an optical disc (the term is most frequently applied to DVD recordable media is the process of writing out support data such as DVD menus (This disadvantage does not apply to DVD-RAM or DVD+RW discs, which require no finalization due to their 'random access' nature. ) Also, the implementation of MPEG-2 compression used on most standalone DVD recorders is required to compress the picture data in real time, producing results that may not be up to the standard of professionally rendered DVD video, which can take days to compress. MPEG-2 is a standard for "the generic coding of moving pictures and associated audio information" This will cease to be an issue in the US by February 2009, as digital broadcast (which is already MPEG2-encoded) becomes mandatory.

A number of manufacturers have combined DVD recorders with hard disk-based digital video recorders, allowing for simple recording to large fixed disks, and the ability to spool these recordings off the DVD at a later date. A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device A digital video recorder ( DVR) or personal video recorder ( PVR) is a device that records video in a digital format to a Disk drive or other

ATSC standalone DVD recorders

As a result of the North American DTV transition, tuner-equipped devices manufactured or imported into the United States are now required by the US Federal Communications Commission to include digital tuners. The United States of America —commonly referred to as the A digital tuner is a tuning device that allows a television or radio set to receive signals via airwaves satellite, or cable and translates them into a

This has caused most new VHS recorders to be implemented as DVD/VCR combo units, or to be manufactured without tuners. DVD (also known as " Digital Versatile Disc " or " Digital Video Disc " - see Etymology)is PLEASE BEAR IN MIND THAT THIS IS A GENERAL ARTICLE ABOUT VCRs/VIDEOCASSETTE RECORDERS The US requirement of ATSC compatibility forces inclusion of MPEG-2 decoding hardware, which is already part of all DVD players but which otherwise would not have been needed in an analogue-only VCR. MPEG-2 is a standard for "the generic coding of moving pictures and associated audio information"

An ATSC-capable DVD unit can also serve as a more-powerful alternative to ATSC converter boxes, which convert existing NTSC analog television receivers to digital operation. NTSC ( National Television System Committee) is the Analog television system used in the United States, Canada, Japan, Mexico Analog (or analogue) television encodes Television picture and sound information and transmits it as an Analog signal: one in which the The DVD recorders offer additional capabilities, such as automated timeshifting of programming and a variety of output formats, that are deliberately not included in the most common mass-market US ATSC converters.

MiniDVD recorders

8cm miniDVDs are widely used on some digital camcorders, primarily those meant for a consumer market ("point and shoot"); such discs are usually playable on a full-sized DVD player, but may not record on a full-sized DVD recorder system. There are two types of MiniDVDs. 80 mm DVD, which are smaller versions of the 120 mm DVD cDVD, which are standard A camcorder is a portable Consumer electronics device for recording Video and audio using a built-in recorder unit A camcorder is a portable Consumer electronics device for recording Video and audio using a built-in recorder unit A point-and-shoot camera, also called a compact camera, is a Still camera designed primarily for simple operation Though popular for their convenience (in the manner of VHS-C), DVD camcorders are not considered suitable for more than casual use due to the much higher level of compression used compared to MiniDV and the difficulty of editing MPEG-2 video. VHS-C is the compact VHS format introduced in 1982 and used primarily for consumer-grade compact Camcorders. Digital Video (DV is a Digital video format created by Sony JVC Panasonic and other video camera procuers and launched in 1995 and in its smaller tape Form factor

See also

External links

Digital video is a type of Video recording system that works by using a Digital rather than an analog video signal A digital video recorder ( DVR) or personal video recorder ( PVR) is a device that records video in a digital format to a Disk drive or other DVD (also known as " Digital Versatile Disc " or " Digital Video Disc " - see Etymology)is In Computing, an optical disc drive ( ODD) is a Disk drive that uses Laser light or electromagnetic waves near the Light spectrum PLEASE BEAR IN MIND THAT THIS IS A GENERAL ARTICLE ABOUT VCRs/VIDEOCASSETTE RECORDERS
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