FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Blu-ray. The Blu-ray disk has emerged as clear leader in today’s optical storage market. Unlike CDs and DVDs, which use a red laser to read and write data, a Blu-ray disk uses a blue laser, which dramatically increases capacities and data transfer rates over CDs and DVDs.

Detailed explanation-2: -A Blu-Ray disc can hold 25-50GB of data (a dual-layer Blu-Ray disc can hold twice that). Blu-Ray discs are random-access devices. Blu-Ray discs are used in the same way as DVD-ROMs (see above) but, since they can hold more data, they are also used to store very high-quality, high-definition (HD) video.

Detailed explanation-3: -CD-RW drives, also called CD writers, CD burners, or CD recorders, sell for $25 or so. CD writers read the same formats as CD-ROM drives CD-DA, CD-ROM, and CD-R/RW discs but can also write data to inexpensive CD-R (write-once) and CD-RW (rewritable) discs.

Detailed explanation-4: -Optical disk storage capacities A CD can store up to up 700 megabytes (MB) of data. A single-layer DVD can hold 4.7 gigabytes (GB) of data, and a double-layer disk can hold 8.5 GB.

Detailed explanation-5: -A DVD is a high capacity, newer generation of CD-ROM that can hold a full-length movie, software, and graphics in a digital format that can be read by DVD players and personal computers with DVD drives. A DVD has the capacity to store up to 20 times as much information as a CD, and it uses both sides of the disk.