Basics Of Optical Disk Drive :
- The need for a storage media larger than the floppy disk led to the appearance of the optical disk, so if we compare the floppy disk
- 3.5-inch optical disk We will find that the floppy disk does not exceed 1.4 megabytes, while the optical disk has reached the capacity of
- Storage to 900 MB, that is, the optical disk equals 625 floppy disks! Therefore, the companies stored their programs on them
- Optical discs and floppy disks began to fade from the computer world.
Types of optical drive:
- 1-ROM-CD player:
- It only reads optical discs and cannot write or re-store them, and it has a maximum storage capacity of
- Discs are 900 MB.
- 2- Read and write optical drive (RW-CD):
- It reads optical discs with the possibility of writing and re-storing them, and it reaches a maximum storage capacity for them.
- Disk 700 MB.
- 3- ROM ± DVD player:
- He only reads optical discs, cannot write and re-store them, and has a maximum storage capacity
- Disk 10 GB.
4- Digital RW ± DVD player:
He reads optical discs with the ability to write and re-store them, and this type of drive is considered
High storage technology and very large storage capacities, up to 10 GB.
Optical Disk Drive components: Optical drive generally consists of three main parts:
- 1- Disc drive and operating system:
- It is the “Drive Disc” of the optical drive, or “Motor Drive Disc” detects it.
- The disc.
- 2- Laser system and lenses:
- It consists of “Laser Lens” which is the laser lens, and “Assembly Pickup Laser” which means the laser assembly area.
- 3- Tracking System:
- It consists of “Drive Tracking” that turns on tracking, and “Motor Tracking” that drives tracking.
- This system moves the laser system and lenses so that the laser beam can track the spiral path and it must be accurate
- The system is very high so that it can move the laser system and lenses with dimensions that reach the micron’s precision.
Optical drive structure:
- It is a piece of plastic with a thickness of approximately 1.2 mm and its diameter is equal to about 12 cm, and it can harden.
- Store one optical disk to 900 MB of data.
- Most optical discs are made of plastic, as they are then pressed into special collisions that are arranged side by side.
- So that it forms a spiral path.
When the plastic molding and compression process is finished, a fine, reflective layer of aluminum is sprayed onto these tablets. distance. This puts a thin “acrylic” layer on the aluminum layer to protect it. Finally, the “Label” poster is printed. Write the contents of the optical disk on it with an “acrylic” layer.
Optical Disk Drive Speed:
- The most important thing that distinguishes optical disc players from each other is the speed of data transmission, whether to or from them.
- ROM-CDs find that they contain only one speed, which may reach “52X” for reading.
- While we find three speeds on a “WR-CD” that is distributed between read and write speed and
- Each CD player has its own read or write speed, for example: If there is a read-only optical drive
- Its read speed is “32X”, which means that it can read 4800KB per second.
- Also, if a “WR-CD” is found, its speeds are (52X / 24X / 52X).
- It means that it can read 7,800 kilobytes in one second, write 7,800 kilobytes in one second, and rewrite it at 3,600
- Kilobyte in one second.
- So every 1X = 150KB
Optical Storage Features:
1- A huge amount of data is kept on a small area.
2- Keeping the data for a long time.
3- Ability to protect data from copies.
4- Ability to save data from writing to it or delete it by mistake.
5- Its small size and low weight make it easy to carry anywhere.
6- Relatively cheap.
Optical storage defects
1- It is easily scratched, causing damage.
2- Ease of breaking and bending.
3- Data protection is relatively weak and can be broken.
How to maintain an optical drive:
1 – Do not expose the optical discs to any liquids.
2- The optical disk must be inserted gently into the actuator gently and carefully and made sure of its correct position in order not to be broken during entry and even
Do not get stuck inside.
3- Not subjecting the optical discs to dust and smoke by putting them in their covers after use.
4- Not to touch the part of the surface that is writable to it directly.
6- Do not expose the cylinder to direct sunlight.
7- Working to periodically clean the optical drive from dust and fine particles that may fall on it.
8- Not to put stickers on the writeable surface.
9 – Not writing on the surface that can be written on.
10. Do not bend optical discs, as bending them may damage them and not rotate them properly within the optical disc player.
11- Do not expose the optical discs to a very high or low temperature.