Optical Drives

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12 hours 9 minutes
Video Transcription
welcome to less than 5.2 optical drives. An overview of CD DVD Blue Ray storage technology.
Let's go ahead and get started, Okay, so our lesson objectives are we're gonna have a brief overview of optical drive technology. They were going to step through the technology as how it evolved. First being of DVDs, skinny CD ROM's and CDR W's didn't go to DVDs.
DVD are W's and DVD R W Do a video. Then we're gonna end up talking about blue rays,
so let's go ahead and jump right in.
all of us is protect this touch this technology in one form of a way or another, whether we're used them as far CD ROM's and used in installed software that came on a city, Rome burned CDs,
DVDs or even the new blue ray technology. Using that technology was optical technology, optical drives
or optical disk, meaning the disc that the media is on. So technically, optical drives are any device that uses light or electromagnetic waves that are either near or visible light spectrum as part of the process of reading or writing data to an optical discs. So there you have it
all this time you were using a CD rahm or a DVD or CD. R W. You are participating in an optical drive technology
where there you were installing an optical drive or had an optical disk that you either burned or read data from some of us who are a little bit older in the field. Remember back when we installed these devices into desktop computers, we had to plug him into the idea ribbon
and had to make sure that we have the power connector in the audio. Jax.
As time went on, that connection changed to a Saito, a serial ST Ah, adapter or connection.
And now you can even have an external DVD or CD around drive by U. S. B port. So this technology has been around for a while, and the purpose here is we're going to step through how this e technology evolved and basically get a basic understanding of what is what in Whatcom, Tia expects you to know.
So let's go ahead and dive right in
and start talking about CD ROM's.
Now optical drives are devices that reads data from of a city rahm disc. CD ROM's is one of our first optical formats. These discard manufacturers such a way that they're small bumps that are red with the laser beam. Optical drives have them in the
in them. A near infrared 780 nano meter
laser die owed. The laser beam was directed onto the disk via and upto electronic tracking module, which then detects whether the beam has been reflected or scattered. The reflected light posters are read by a photo detector.
These incoming posters are decoded by the microprocessor, this scent as usable data to the rest of computer
where it's processed and used.
This disc was able to hold approximately 700 megabytes of information, and they were read only. And at that time that was a lot of information, especially coming from floppy disk. Nowadays, that amount is just the tip of iceberg. What's available now in media?
But again, at that time, 700 megabytes was a lot, and that's how the main way that software was distributed
and in other forms of media,
then we involved to the CDR W's.
The CD R W is another optical format that can be read, written to erased and rewritten to this format was an upgrade to the CD, Rahm read only four men. CDR W's, as opposed to CDs, require specialized readers that had sensitive laser optics. Consequently,
CDR Ws cannot be read in many CD rot. Readers built prior to the introduction of CDR W
CD Rahm Drives with a multi re capabilities were compatible. So that was the next step in the evolution of this optical media was the CDR W's where we can burn our own DVDs or CDs at that time to this media.
And if you're like me, you saw for a technician in the field, you pray, had a lot of this, that you burned these tune and Adam in a binder of some sorts
to keep all their software on handy just in case.
So then we jumped to DVD ROM's DVDs are W's and DVD R W. D L's so start for DVDs.
DVD ROM's digital versatile Disk Eyes, a DVD that can hold 4.7 gigabytes of information on a singer layer DVD room. This optical format is used to distribute large amounts of data that exceeded the limitation of CD ROM's.
So there we have. When CD ROM's had a limit of 700 megabits.
Then we have the DVDs that came out the DVD ROM's and again they could hold set 4.7 gigabytes of information.
Now, as this technology evolved, we then landed on the DVD. Are W's and DVD are W's Came about? What a new technology twist business. Now we could read and write on a DVD optical format. And it's what DVD Ours or Our W's work
on DVD Reed and Reed Rideable optical formats.
And from there, as technology evolved again, we went to DVD R W D L, which stands for dual layer Now. This increased the through the amount of the information that a DVD can hope. Ah, DVD dual layer hailed about 8.5 gigabytes of data.
So we stepped a long ways from the 700 megabytes upto 8.5 gigabytes.
And now technology has moved on to the Blue Ray Blue Ray Blue BDR and the beady Ari. Now Blue Ray isn't in a newer optical format on dhe, it's a In that format is a single layer, which was about 25 gigabytes of data. Now the name Blue Ray actually comes from the light
that it's omitted from the optical reader itself.
It's a blue or violet laser that Reese the disc in his format and allows information stored at a greater density, then then possible with a longer wavelength red laser used for DVDs. So this was a newer technology that allowed Maur data to be written to those disks 25 gigabytes.
Then, in this family, we also have the Beaty Beaty ours, which is the recordable optical format for the Blue Ray, then the beady Ari's. And this is the Blue Ray read, erased and rewriteable version.
We've kind of went over and talked about the CD ROM's and CDR W's and how we step from there to the DVD ROM's DVD are W's in the DVD dual Layers,
and we finished talking about the Blue Rays Beat ers and a BTR. He's so again, just a brief overview of these optical formats. Andan the optical drives just to get to a basic understanding. So you're ready for the comp thio.
So that concludes our lesson for today, and we will see you in the next lesson.
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