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| ripping is another name for | Digital Audio Extraction |
| Digital Audio Extraction (DAE) is the process of | copying audio from a CD to another medium while keeping the audio in its original digital state. |
| When a CD player/drive plays a Red Book CD (CD audio format) the drive performs a | digital-to-analog conversion in real-time so the audio can be played through speakers. |
| Songs are stored in tracks on the CD is "streamed" to the drive where special digital audio extraction software | reads the raw information of a track as it is streamed and collects the information into a .WAV file. |
| When DAE is used to create .WAV files on a computer, they are | uncompressed and can be quite large in size. |
| MP3 and Ogg Vorbis | compress raw files into much smaller files with minimal loss of song quality. |
| Digital versatile disc | DVD |
| Depending upon the layering and single or double-sided disc, DVDs can store close to | 20 times the amount of information as a single CD. |
| DVDs are able to store more information because they provide a | greater area for data storage, use a higher density recording technique, and can access multiple layers within the media |
| Computer DVD drives can also play movies and music as well as | read data discs. |
| DVD drives are backwards | compatible with CDs |
| DVD players are comprised of a drive motor for spinning the disc, a laser assembly for reading the DVD, a tracking mechanism for | moving the laser assembly into the desired area, and communication circuits for moving the data to its destination. |
| All home DVD players and some computer DVD drives have an MPEG-2 decoder for | decompressing the video data into a format that can be shown on a television screen or monitor. |
| A single layer DVD has only a single reflective layer of material, a dual layered disc contains a | semi-transparent layer over the top of a completely reflective layer. |
| The DVD player laser must be able to distinguish between the two layers of the media by | focusing on the correct layer of material containing the desired data. |
| four different methods of DVD recording | DVD-R , DVD-RAM, DVD-RW , DVD+RW |
| DVD-R | used for DVD authoring and is not very practical for consumers due to the price of drives and media, can hold 4.7GB of data per side |
| DVD-RAM | allows users to write and overwrite discs 100,000 times; uses phase-change technology similar to CD-RW drives and stores 4.7GB of information on each side of the disc |
| DVD-RW | Geared more towards general-use; uses a "caddy less" system; rewrite information 1000 times; compatible with most DVD-ROM drives |
| The DVD-RW drive uses a sequential recording technology used primarily for | streaming media. |
| DVD-RW is capable of writing | 4.7GB of information to each side of a disc. |
| DVD+RW compatible with existing hardware and is | easily written to multiple times; has the ability to use a variable bit-rate when encoding certain types of media (such as streaming video). |
| Red Book | defines an audio CD; specifies how songs are placed in tracks on the disc. |
| Yellow Book | format allows for data to be written as files instead of as streaming information. |
| Green Book | format was specially designed to synchronize audio and video data for multimedia applications |
| Orange Book | standard defines the physical format for recordable CDs |
| White Book | standard addresses the method of recording MPEG1 audio, video, and still graphics to a Video CD (VCD). |
| Blue Book | standard specifies the format of Enhanced CDs (E-CD) |
| E-CDs are stamped multisession discs that feature | Red Book audio and Yellow Book multimedia data on a single disc. |
| DVD-ROM is designed for | storing computer files. |
| DVD-Video is the format used by stand-alone DVD players for | movies and extras |
| DVD-Audio is a newer format that includes | multiple channel audio with many options. |
| DVD 5 is a | single sided, single layer DVD with a storage capacity of up to 4.7 GB. |
| DVD 9 is a | single sided, dual-layered DVD and it has a total capacity of 8.5 GB. |
| DVD 10 is a | double sided, single layer per side DVD with a capacity of 9.4 GB. |
| DVD 18 is a | double sided, dual-layer per side disc with a total capacity of 17 GB. |
| DVD layering is the process in which the | read laser of a drive is able to focus at different "layers" inside the disc. |
| double-sided disc has almost | four times the surface area on which to store data. |
