If you are looking to buy a CDROM or DVD drive online, you’ve come to the right place to find information where to purchase CDRom and DVD drives and how to handle them. We get a lot of questions from people about the difference between CD-ROM and DVD so below we are giving you some info. A lot of questions are also about installing CD and DVD drives and how to repair CDRom and DVD drives. Take a look at all the questions and answers on this site and do participate in the discussion!
CD-ROM discs are generally similar in appearance to audio compact disks, and data are stored and retrieved in a very comparable way (only differing from audio CDs in the standards utilized to store the data). Discs are created from a 1.2 mm thick disc of polycarbonate plastic, with a thin layer of aluminium to create a reflective surface area. The most common dimension of CD-ROM disc is 120 mm in diameter, although the smaller Mini CD standard with an 80 mm diameter, as well as a lot of non-standard sizes and shapes (e.g., business card-sized media) are also obtainable.
Data is stored on the disc as a sequence of microscopic indentations. A laser is shown on to the reflective surface of the disc to read the pattern of pits and lands (“pits”, with the gaps between them referred to as “lands”). Since the depth of the pits is approximately one-quarter to one-sixth of the wavelength of the laser light utilized to read the disc, the reflected beam’s phase is shifted in relation to the incoming beam, causing destructive interference and decreasing the reflected beam’s intensity. This pattern of changing intensity of the reflected beam is converted into binary data.
DVD, also known as Digital Video Disc or Digital Versatile Disc, is an optical disc storage media format, and was invented and designed by Philips, Sony, Toshiba, and Time Warner in 1995. Its primary uses are video and data storage. DVDs are of the same dimensions as compact discs (CDs), but are capable of storing more than six times as much data.’
Variations of the term DVD often indicate the technique data is stored on the discs: DVD-ROM (read only memory) has data that can only be read and not written; DVD-R and DVD+R (recordable) can record data only once, and then function as a DVD-ROM; DVD-RW (re-writable), DVD+RW, and DVD-RAM (random access memory) can all record and wipe off data multiple times. The wavelength used by standard DVD lasers is 650 nm; thus, the light has a red color.
DVD-Video and DVD-Audio discs refer to properly formatted and structured video and audio content, respectively. Other types of DVDs, including those with video content, may be referred to as DVD Data discs.