Common Hardware glossary! Absolutely authoritative! (Go !) Iv. Optical Drive Glossary

Iv. Optical Drive Glossary
　　
CLV technology: (Constant-Linear-Velocity) Constant line speed reading method. The technology used in an optical drive that is less than 12 times faster. It is used to change the speed of the rotating disc at any time to keep the data transfer rate unchanged. The speed of reading data along the internal direction is much faster than that of the external side.
　　
CAV technology: (Constant-Angular-Velocity) Constant Angular speed reading method. It reads data on the disc at the same speed. However, the internal data on the CD is less efficient than the external data transmission speed. The greater the external data transmission speed, the higher the speed is the highest data transmission rate.
　　
PCAV technology: (Partial-CAV) area constant angular speed reading method. It is a new technology that integrates CLV and CAV. It uses CAV technology to read the outer edge data and CAV technology to improve the overall data transmission speed.
　　
UDMA mode: (Ultra-DMA/33), a data transmission method developed by Intdl and Quantum in 1996. The I/O system's burst data transmission speed can reach 33 MB/s, it can also reduce the CPU usage of the I/O system. Now we see the UDMA/66, which is twice faster.
　　
PIOM Mode: (PIO-Mode) previously widely used data transmission Mode. Each operation can be completed only through the CPU, occupying a large amount of CPU resources.
　　
SCIC Interface: (Small-Computer-Sysem-Interface) is a new type of external Interface that can drive multiple external devices. The data transmission rate can reach 40 MB, which will become the standard for external interfaces in the future, expensive. However, it consumes less CPU resources and works stably.
　　
IDE interface: (Integrated-Drive-Electronics) is a commonly used external interface, mainly connected to hard disks and optical drives. It adopts 16-Bit Data parallel transmission mode, which is small in size and fast in data transmission. One IDE interface can only be connected to two external devices.
　　
Speed: this refers to the data transmission rate of the optical drive. The International Electronics Industry Federation sets the data transmission rate of KB/s as a single speed drive. The data transmission rate of kb/s is double speed. Calculated in sequence.
　　
Data transfer rate: (data-transfer-rate) refers to the amount of kilobytes data that can be read from the optical drive per second on the optical drive, which directly determines the operating speed of the optical drive. The data transmission rate of A Single Drive is kb/s.
　　
Average read Time: (Average-Seek-Time) refers to reading data after the laser head moves to the specified pre-read data (this Time is rotation-latency, the time required to transmit the data to the circuit. It is also an important indicator of the drive speed.
　　
Cache capacity: it provides a data buffer. First, the read data is saved for one-time transmission. Solve the speed matching gap with other devices.
　　
Laser head: it moves out of the center in the Table-of-Contents area. It emits a laser to find the specified position on the disc, and the sensor resistance receives the reflected signal and outputs it as electronic data.
　　
CD: (Compact-Disc. CD is recorded by liad-in (the position where the data starts to be recorded), and then the Table-of-Contents area, with internal and external records; add a lead-out data track end record after the record. On the CD, the analog data is carved on the CD using a large recorder to render many small pitfalls invisible to the naked eye.
　　
CD-DA: (CD-Audio) a butterfly that stores digital sound effects. In 1982, SONY and Philips jointly formulated redbooks standards to store sound data in audio tracks. The CD-ROM is compatible with the ability of this specification music piece.
　　
CD-G :( Compact-Disc-Graphics) adding a graph on the basis of the CD-DA becomes another style, but cannot be promoted. Is an attempt to multimedia computers.
　　
CD-ROM :( Compact-Disc-Read-Only-Memory) Read-Only optical Disc machine. In 1986, SONY and Philips jointly formulated a Yellow Book Standard to define the format of archives. MODE1 for computer data storage and MODE2 for compressed video image storage are defined to make cd a common storage medium. In addition, an error code and a correction code are added to ensure that the computer data is completely read correctly.
　　
CD-plus: Microsoft announced the new enhanced CD standard in 1994, also known as CD-elure. It places the CD-Audio Sound Effect on the first track of the CD, and then puts the data file. As a result, the CD will only read the audio track and will not read the data track, to achieve the benefits of both computer and audio.
　　
CD-ROM XA :( CD-Rom-extended-Architecture) 1989, Sony, Philips, micuosoft on CD-ROM standard extended White Paper Standards. It can also be divided into form1, form2, and an enhanced CD standard CD +.
　　
VCD: (Video-CD. Sony, Philips, JVC, Matsushita, etc. It is a fully dynamic, full-screen laser, film, and video disc.
　　
CD-I: (compact-disc-interactive) year, is Philips, Sony jointly developed the Green Book standards. Is an interactive CD system. Full-dynamic video image playback in 1992
　　
Photo-CD: in 1989, Kodak released the Orange Book Standard for photo CDs, which can store 100 high-resolution photos in five formats. You can add corresponding commentary and background music or episodes to become an audio and electronic image set.
　　
CD-R :( compact-disc-recordable) 1990, Philips published a multi-segment one-time writing disc data format. It is an Orange Book Standard. Add a one-time record dyeing layer to the disc to enable burning.
　　
CD-RW: Add a Rewritable dyeing layer on the disc, through the laser can repeatedly write data on the disc.
　　
Sdcd :( super-density-CD) is Toshiba, Hitachi, Pioneer, Panasonic, JVC, Thomson), Mitsubishi, timewamer and so on to develop a kind of ultra-density optical disc specification. 5 GB storage on both sides, low data compression ratio
　　
Mmcd: (Multi-mdeia-CD) is a multimedia disc developed by Sony, Philips, and other companies. It provides GB storage space on one side, resulting in high data compression.
　　
HD-CD :( High-Density-CD) High Density disc. Large capacity. The single-sided capacity is 4.7 GB, the dual-sided capacity is up to 9.4 GB, and some reach 7 GB. HD-CD disc adopts MPEG-2 standard.
　　
MPEG-2: motion images and sound encoding standards developed by ISO/IEC in 1994. Compression and decompression of broadcast-level images and stereo signals.
　　
DVD :( Digital-Versatile-Disk) Digital multi-purpose CD, with MPEG-2 as the standard, with a large capacity of 133g, can store minutes of high resolution dynamic video programs, including a Dolby Digital surround sound track, the image and sound quality is inferior to that of VCD.
　　
DVD + RW: a dvd disc that can be repeatedly written, also known as DVD-E. A standard jointly released by HP, SONY, and Phioips. The capacity is 3.0 GB, and CAV technology is used to achieve a high data transmission rate.
　　
PD optical drive :( PowerDisk2) is Panasonic Company will write optical drive and CD-ROM combined into one, there are LF-1000 (external) and LF-1004 (internal) two types. The capacity is 65OMB, and the data transmission rate is 5.0 MB/s. The miniature laser head and precision Electromechanical Servo system are used.
　　
ABS Balance System: (Auto-Balance-System) is equipped with the latest Mitsubishi DIAMOND series high-speed optical drive, which is installed with a steel baht bearing under the drive tray, when the optical drive vibrates, the ball plays a balanced role under the action of centrifugal force to the light part of the quality, and increases the reading capability.
　　
Partial Installation: (Partial-Installation) when installing the software, only some necessary or basic files are installed. When performing special functions, you can read or execute the files on the CD, in this way, the system can be equipped with a high speed, high efficiency and high stability of the optical drive, to achieve the best performance
　　
DVD-RAM: A commercial read/write DVD standard established and published by the DVD Forum Association. It has large capacity, low price, low speed, and high compatibility.