One of the most common media for storing information today is compact discs. We all know compact discs like CD, DVD. But not everyone knows about their types.
CD — compact Disc — compact disc
DVD - digital versatile Disc - universal digital disc
HD DVD - high definition DVD - high quality DVD
BD - Blu-Ray Disc - (we didn't know the translation)
- CD-disks are usually up to 700MB in size. That's why you can't write a lot of information on them. CDs are mainly designed for recording songs and small amounts of data. The main types of CDs:
— CD-ROM - Compact Disk-Read Only Memory (compact disk - for reading only) - a disk with a ready-made program or similar product written in it, usually in certain enterprises;
— CR-R - Compact Disk - Recordable (compact disk - for one-time recording) - commercially available rotating, hollow disk;
— CD-RW — Compact Disk-Rewritable (compact disk - for multiple rewritable) - a commercially available disk designed to erase and rewrite recorded data.
— DVD-disks have an average of 4,5 gigabytes of space. They are mainly designed for storing large movies and data. The main types of DVD disc:
— DVD-ROM is a disc like CD-ROM, only larger in size;
— DVD-Video – disc intended for recording audio and video formats in compact form;
— DVD-Audio is a disc format designed to record high-quality, uncompressed audio;
— DVD-R(G) is a recordable disc;
— DVD-R(A) – a disc intended for reading only with a special device;
— DVD+R(G) – disc designed for one-time information recording;
— DVD-RAM is a multi-rewritable disc, based on CD-RW technology, developed by Hitachi, multi-rewritable;
— DVD-RW — developed by the company "Pioner" and based on CD-RW technology, it is not intended for multiple rewriting;
- DVD+RW - developed by "Philips", "Sony" and "Hewlett-Packard" corporation. Not compatible with DVD-RW format;
— DVD-VR – designed to record real-time videos in MPEG2 format.
— HD-DVD is designed to store high-quality video formats, and its size is much larger than ordinary DVD discs — 15 gigabytes.
- When we talk about CD and DVD discs, we should also talk about their physical size. HD-DVD and BD discs, however large their storage capacity, are 12 cm in diameter, just like regular DVDs and CDs. However, there are also DVD discs with a diameter of 8 cm, their size is usually around 1 gigabyte, and they are used for recording additional programs for various devices.
