Optical Drives - CompTIA A+ 220-1101 – 2.7
Let’s have a look at optical drives.
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Optical Drives
Optical drives use a flat circular disk to encode data. They became popular in the 80’s due to being able to store a lot of data for a relatively cheap price compared with other technologies. Nowadays, it has become a legacy technology with the increased use of network storage and flash media becoming more affordable and easier to use.
There have been many different optical disks over the years, but there are only three that you see commonly used nowadays. The main difference between the different disks is the amount of data that each can hold.
It is unlikely that you will encounter any questions regarding optical media on the A+ Exam, and if you do, they are unlikely to be especially challenging. CompTIA tend to favor newer technology in the exam questions. For the exam, just have a general idea of how optical media works. Even though it is now a legacy technology, in business it is still sometimes used, thus the IT technician needs to have an understanding of how to use it.
To get a better understanding of optical drives, let’s have a look at the media types.
Optical Media Types
There are a few different media types available. The main thing to look out for is the abbreviations. R means read only. That is, you can write to the disk once and once only. RW or RE means the disk can be written to many times. That is, you can write data onto the disk and overwrite it later. DL stands for dual layer which is a technology that allows two layers of data to be stored on the optical disk. The way this works is, the laser re-focuses to access the top or the bottom layer, however, only one layer can be accessed at once. The advantage of dual layer is that you double the amount of data stored on the optical disk.
Compact disc allows you to store 650 Megabytes to 900 Megabytes of data. The highest range is called overburn as it burns data outside of the official standard. In the old days this could cause compatibility problems between different optical drives, but is not such a problem nowadays. I will go through the specs so you get an idea what each can achieve, but don’t worry about memorizing them. Later in the video I will go through what you need to know in the real world.
If the CD is manufactured in a factory, it will just be called CD. The write once type will end in R and the rewritable will end in RW.
For DVDs, they will store in a single layer 4.7 Gigabytes. As before, a DVD manufactured in the factory will just be DVD. DVD differs from the others in that there is a -R format and at +R format. -R and +R use different methods to write data to the optical disk. Your media will be labeled as minus or plus. In the old days, optical drives would only read one or the other. As time passed, they supported both. It is nothing to worry about, because that was a long time ago and any modern optical drive will support both.
As before, DVD supports rewriteable disks both in the minus and plus formats. DVD adds DL for dual layer which effectively doubles the amount of storage.
Blu-ray is much the same. Blu-ray supports 25 Gigabytes per layer. For the manufactured optical disks it uses DB. For the write once disks it uses -R and rewriteable uses RE rather than RW. Blu-ray supports dual layer and as before uses DL for this kind of media.
I would not worry too much about remembering all this information. Let’s have a look at what you would do in the real world.
In The Real World
In the real world, the simplest way to work out which media to use I s to look at the storage size of the media. Since optical media has been around a long time and is not used that much nowadays, the media available is quite mature and there are not too many brands available. You will probably find it hard to find a store that sells it and if they do there will not be much choice.
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References
“The Official CompTIA A+ Core Study Guide (Exam 220-1101)” pages 63 to 64
“Mike Myers All in One A+ Certification Exam Guide 220-1101 & 220-1102” pages 407 to 414
“Picture: Compact Disc” https://commons.wikimedia.org/wiki/Fi...
“Picture: DVD logo” https://commons.wikimedia.org/wiki/Fi...
“Picture: Blu-Ray Logo” https://commons.wikimedia.org/wiki/Fi...
Credits
Trainer: Austin Mason https://ITFreeTraining.com
Voice Talent: A Hellenberg https://www.freelancer.com/u/adriaans...
Quality Assurance: Brett Batson https://www.pbb-proofreading.uk
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