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DVD-R is a DVD recordable format that typically has a storage capacity of 4.7 GB, which is considerably more storage capactiy than its predecssor, the compact disc. The DVD-R format was orginally developed by Pioneer in 1997. The technology is supported by more DVD players that are currently used at home.

The reason for the larger storage capacity is through the addition of small pit sizes in the groove sprials of the DVD. These small pits guide the laser when it is being played in the device. DVD-R and DVD+R use different colored dyes to absorb the wavelengths when recording and playing. The ability to copy DVD’s has been a huge addition to the video and media world.

DVD-R discs are actually 2 small discs placed together with an adhesive. One disc contains the guide that the laser passes through and the other is coated with a recording dye and either a silver or gold colored reflector. The discs come paired toegther to prevent sractches which is a common problem of compact discs and DVD’s.

If the DVD is double sided, the user has to flip it to access the information on the other side. This style is common for longer videos or to include additional features such as commentary, extra scenes, deleted scenes or other material that would not typically fit on a single disc. This information is placed on the DVD’s using sophisticated DVD copy software.

DVD-R and DVD+R technology are not directly compatible and this has created a format war within the DVD industry. Some manufacturers have created hybrid drives that can read both in an attempt to satisfy a larger quantity of consumers and suppliers, allowing consumes to view and copy DVD’s with the same device.

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There are several DVD formats, here is comprehesive and descriptive list:

• DVD-ROM- these have a reflective surface and can be single-sided/single-layered single-sided, single-sided/double-layered, double-sided/double-layered. They are the most similar to compact discs in appearance.
• DVD-D’s are a disposable DVD format. They are designed to be self destrutable, oxidizing within a few hours after opening and can be used for secuity reasons and are great for the environment.
• DVD Plus combines DVD and CD technologies together by providing 2 layers of technology
• DVD-R for Authoring- this is a special type of DVD-R that is used to record master DVD’s that can be used for later mass distribution copy. DVD copying software is used when replicating the master DVD.
• DVD RAM are discs that can be single or double sided and are only compatible with a small number of DVD drives.
• DVD+R were designed for recording, but you can only record once. These are most commonly used when burning DVD’s.
• DVD+RW are rewritable and can be used multiple times. These are best if you have material that you need to distribute multiple times by creating several DVD copies.

Each of these DVD formats serves a specific purpose and is compatible with specific DVD, audio and video devices. When you are evaluting which technology to use, be sure to review your frequency of use, the purpose for DVD copying or reading and the machinery and technology that you currently have in place so that you can purchase the best match for your needs.

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DVD Ram discs were launched in 1996 and are most commonly use in home computers, camcorders and other personal video recorders. DVD RAM is considered to be a very reliable format since the discs actually have some built in error controls and tools to remove defects. This is the most popular technology fo use for personal home computer use such as data back up, data storage and data archival. This technology can easily copy DVD information onto the discs, as well as remove information as needed. The information is stored within special tracks to be read with compatible devices.

There are several other advantages for DVD RAM’s:

• The data is designed to have a long life, estimated to be 30 years+
• They can be used multiple times for writing and copying, allowing you to copy DVD’s with your home computer or media player
• The system is reliable
• There are disc management tools that protect data
• This format is suitable for archival storage
• DVD burning software is not always required
• Considered to be one of the easiest DVD technologies to use

Some current disadvantages of DVD RAM are:

• The technology is not always compatible with DVD+RW and DVD-RW.
• It can be more expensive than other DVD technologies
• DVD burning can be slower than other DVD methods

While there is some debate about which DVD technologies are the best, DVD RAM still remains the most used in camcorders and for home data back up needs.