Monday, 1 October 2012

All about the Optical Disc-Get to Know About It

What is an optical disc technology?

Optical disc is an unbelievable gift of the science and technology. It is electronic data storage, which help people to read and write the data by using a low-powered laser beam. It is featured by a flat, circular, plastic or glass dick and in this data is stored in the form of light and dark pits. It has brought a great revolution in the business world. There are three types of optical disks such as Read-only optical disk, WORM, and Rewritable/Magneto-optic disk. If you want to know about these main types of optical disc, then let’s here discuss about these particular types at a glance that goes as follows:

*   Read-only optical disks: This is one of the types of the optical dick and CD, CD-ROM, DVD-ROM, and DVD-Video are the examples of it. These disks at the time of manufacturing are recorded and can’t be erased and it is the quality of this type of optical disc.

*   WORM: The second type of optical disk comes as WORM, which stands for Wright Once and READ Many. You can record this type of optical disk only once, but you can’t erase it. And once these are recorded, they treat as a read-only optical disk CD-R, DVD-R, and WORM CDs and DVDs are write-once.

*    Rewritable/Magneto-optic disks: The Rewritable/Magneto-optic disks are the third and last type of optical disks and these can be erased and written to with the new information as well. Examples of rewritable disks are CR-RW, DVD-RAM, DVD-RW, and magneto-optic. Undoubtedly, this type of optical disk uses magneto-optic or phase change technology.

Optical Disks vs. Magnetic Disks

We know that the DVD/CD multimedia storage is the demand of this technical age and most of the people are taking these optical storage disks in use for various purposes. The optical disks offer many advantages over magnetic storage media and these advantages are highest storage capacity, low cost per Megabyte of storage, environmental condition tolerance, high data stability, long media life and many more. It is incredible that an optical disk has much more storage capacity on the order of gigabytes, than a magnetic disk and it can store up to 6GB of data as compare to 1.44 MB of a diskette. As the optical disks are inexpensive to manufacture, most of the businesses, which are offering the services of DVD printing and packaging, they offer the optical disk services. These optical disks as compare to the magnetic disks are less venerable to extremes of hot and cold. Not only this, but the optical disks have also long media life than magnetic disks.

What are the optical storage devices?

You must have heard about the devices of optical storage, which are CD-ROM, DVD-ROM, CD, CD-RW, and DVD-RW. Let’s have a look on these devices of optical disk at a glimpse:

CD-ROM: The CD-ROM is also known as Compact Disk Read-Only Memory. This type of CD contains computer data, which can’t be read or rewritten. The information contain by this compact is accessible by a computer. It can be read using a CD-ROM drive, which is almost common on the personal computers. A CD-ROM sector contains 2352 bytes and it can be further divided into 98 24-byte frames. A CD-ROM drive can transfer data up to the speed of 7800v
DVD-ROM: We also know DVD-ROM as Digital Versatile Disc- Read only memory. An optical disc storage media format can be used for data storage, which may include movies with high video and sound quality. These types of DVDs are read-only disks and have storage capacity for 133 minutes of high quality video. DVD-ROM also supports disks with capacities of 4.7 GB to 17 GB and access rates of 600 KBps to 1.3 MBps. 

CD-RW: CD-RW is also known as Compact Disc-rewritable and it is recordable CD format, which can be erased and rerecorded multiple times just like a hard disk. It can be read everything expect a DVD.

DVD-RW: We also know DVD-RW as Digital Versatile Disk-Rewritable. It is record up to 4.7 GB per side in the same way as a CD-RW does. We can erase the information stored on DVD-RW and recode over many times without damaging the medium.

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