Author: apphiabenjamin

• This is a digital data storage format for optical discs.
• Blu-Ray Discs were designed to supersede the DVD format.
• It is capable of storing high-definition and ultra high definition video resolution (2160p).
• It is expensive.
• Blu-Ray Discs use a blue laser.
• The Blu-Ray includes support for multiple layer discs which then allows the storage capacity to be increased to 100GB – 200GB (25GB per layer).

     SIZE:

• The plastic disc is 120mm in diameter and 1.2mm thick,the same as DVDs and CDs.

• CD-ROM, created in 1985 by Sony and Philips.
• It can store 720 MG of data
• It is inexpensive.
• The CD-ROM uses minute (small) plastic encapsulated disk which can store data.
• The information on the CD-ROM is retrieved using a laser beam

 SPEED:

• The CD-ROM can be classified by their rotational speed,for example:

1X  = 150 Kbytes/s

  2X = 300 Kbytes/s

1. CD and DVD Drives are storage devices that are referred to as optical storage devices.
2. The difference between the CD and DVD drives are:

•  the CD is an optical medium which can store digital data
• whereas the DVD can hold 4.7 GB of data, hence, it is widely used to store larger files such as videos and movies.

• CD-RW drives, also known as “Compact Disc-Rewritable” drive is a digital optical disc storage format.
• They can function in a way like a hard disk or floppy.
• It is also a great choice when you need to store small amounts of data over time, for example, a daily backup of a few critical files.
• It is expensive and are called burners.
• Can provide full read or write capabilities.
• They have not change in shape but their storage capacity has increased up to 650-700 MB.
• It can be rewritten approximately 1000 times.

USES:

• CD-RW drives can be recorded and erased multiple times.
• It can hold data or music.