Optical memory was developed by Philips and Sony and released in 1982 in the fourth generation of computers. These memories use light beams for its operations and require optical drives for its operations. These memories are used for storing audio/video, backup as well as caring for data. Read/write speed is slower compared to hard disk and flash memories. Examples of optical memories are Compact Disk (CD), Digital Versatile Disk (DVD), and Bluray Disk (BD).
Here, we have discussed only Compact Disk (CD) in brief.
Compact Disk (CD):
It stores data and it has circular plastic, single side of the plastic is coated by aluminium alloy which stores data. It is protected by additional thin plastic covering. CD requires a CD drive for its operation.
A CD could store much more data than a personal computer hard drive. The CD has storage typically up to 700 MB (up to 80 minutes’ audio).
Types of Compact Disk (CD) :
These are various types of CD as follows below.
- CD-R – It is a blank CD in which data can be stored once which is known as CD-ROM after storing data on it.
- CD-ROM – It became a ROM (read only memory), in which you can not update or delete data. Only you can read data using a CD-drive.
- CD-RW – You can update or delete data multiple times, if you want to do so.
Advantages of CD:
- It can store data for long time, i.e., durable memory.
- It is a reliable and widely used memory.
- It provides random data access.
- It can not be affected by the magnetic field.
- It is economical, i.e., stores more data in less space.
Disadvantages of CD:
- It is a good memory but slower than a disk.
- Writing or copying data on CD is not easy.
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- Difference between Magnetic Disk and Optical Disk
- Magnetic Disk Memory
- Hard Disk Drive (HDD) Secondary memory
- Difference between Random Access Memory (RAM) and Hard Disk Drive (HDD)
- Introduction to memory and memory units
- Introduction of Secondary Memory
- Difference between Hard Disk and Floppy Disk
- Difference between Seek Time and Disk Access Time in Disk Scheduling
- Difference between Random Access Memory (RAM) and Content Addressable Memory (CAM)
- Optical Storage Systems
- Difference between Virtual memory and Cache memory
- Random Access Memory (RAM) and Read Only Memory (ROM)
- What is CDFS (Compact Disc File System)?
- Difference between Byte Addressable Memory and Word Addressable Memory
- N-Step-SCAN disk scheduling
- Difference between SCAN and LOOK Disk scheduling algorithms
- Advantages and Disadvantages of various Disk scheduling algorithms
- Difference between Uniform Memory Access (UMA) and Non-uniform Memory Access (NUMA)
- Difference between Seek Time and Rotational Latency in Disk Scheduling
- Difference between Rotational Latency and Transfer Time in Disk Scheduling
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