Optical Drives

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Time
12 hours 9 minutes
Difficulty
Beginner
CEU/CPE
12
Video Transcription
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>> Welcome to Lesson 5.2, optical drives.
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An overview of CD,
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DVD Blu-rays storage technology.
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Let's go ahead and get started.
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Our lesson objectives are,
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we're going to have a brief overview of
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optical drive technology,
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then we're going to step through
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the technology as how it evolved.
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First being with DVDs,
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skimming CD-ROMs and CD-RWs then go to DVDs,
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DVD-RWs, and DVD-RW DL,
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then we're going to end up talking about Blu-rays.
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Let's go ahead and jump right in.
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All of us has probably touched
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this technology in one way or another.
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Whether we use them as far as
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CD-ROMs and use in
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installed software that came on a CD-ROM,
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burn CDs, DVDs, or even the new Blu-ray technology.
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Using that technology was an optical technology,
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optical drives or optical disk,
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meaning the disk that the media is on.
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Technically, optical drives are any device that
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uses light or electromagnetic waves that are
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either near or visible light spectrum as part of
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the process of reading or
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writing data to an optical disk.
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There you have it. All this time you are using
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a CD-ROM or DVD or CD-RW,
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you are participating in an optical drive technology.
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Whether you are installing an optical drive
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or had an optical disk
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that you either burned or read data from.
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Some of us who are a little bit older in the field.
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Remember back when we installed
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these devices into desktop computers,
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we had to plug them into the IDE ribbon and had
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to make sure that we have the power connector
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and the audio jacks.
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As time went on,
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that connection change to
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a Serial SATA adapter or connection.
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Now you can even have
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an external DVD or CD-ROM drive by USB port.
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This technology has been around
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for a while and the purpose here is,
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we're going to step through how
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this technology evolved and
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basically get a basic understanding
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of what is what in what Comp TIA expects you to know.
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Let's go ahead and dive right in
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and start talking about CD-ROMs.
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Now, optical drives are devices that reads
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data from a CD-ROM disc.
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CD-ROM is one of our first optical formats.
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These disk are manufactured in such a way that there are
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small bumps that are read with a laser beam.
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Optical drives have in them,
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a near infrared 780-nanometer laser diode.
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The laser beam is directed onto the disk
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via an optoelectronic tracking module,
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which then detects whether the beam
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has been reflected or scattered.
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[NOISE] The reflected light pulses
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are read by a photodetector.
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These incoming pulses are decoded by the microprocessor.
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They're sent as usable data to the rest of
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the computer where it's processed and used.
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This disk was able to hold
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approximately 700 megabytes of information,
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and they were read-only.
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At that time that was a lot of information,
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especially coming from floppy disk.
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Nowadays, that amount is just the tip of the iceberg,
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what's available now in medium.
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But again, at that time,
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700 megabytes was a lot.
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That's how the main way the sulfur was
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distributed and other forms of media.
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Then we evolve to the CD-RWs.
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The CD-RW is another optical format that can be read,
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written to, erased, and rewritten to.
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This format was an upgrade to
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the CD-ROM read-only format.
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CD-RWs as opposed to CDs require
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specialized readers that has sensitive laser optics.
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Consequently, CD-RWs cannot be read in
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many CD readers built prior to the introduction of CD-RW.
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CD-ROM drives with
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a multi-read capabilities were compatible.
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That was the next step in the evolution of
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this optical media was the CD-RWs where we
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can burn our own DVDs or CDs at that time to this medium.
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If you are like me,
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a technician in the field,
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you probably had a lot of disk that you burn
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these tune and add them in a binder
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of some sorts to keep
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all this software on handy just in case.
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Then we jump to DVD-ROMs,
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DVD-RWs and DVD-RW DLs.
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Let's start off with DVDs.
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DVD-ROMs, digital versatile disk is a DVD that can hold
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4.7 gigabytes of information on a single layer DVD-ROM.
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This optical format is used to distribute
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large amounts of data that
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exceeded the limitation of CD-ROMs.
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When CD-ROMs had a limit of 700 megabits,
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then we have the DVDs that came out, the DVD-ROMs.
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Again, they can hold 4.7 gigabytes of information.
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Now, as this technology evolved,
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we then landed on the DVD-RWs.
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DVD-RWs came about
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what a new technology twist because now,
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we could read and write on a DVD optical format,
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and that's what DVD-RWs were,
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DVD read writable optical formats.
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From there as technology evolved again,
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we went to DVD-RW DL,
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which stands for dual layer.
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Now, this increase the amount
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of information that a DVD can hold.
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A DVD dual-layer held about 8.5 gigabytes of data.
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We stepped a long ways from
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the 700 megabytes up to 8.5 gigabytes.
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Now technology has moved onto the Blu-ray,
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BD-R, and BD-RE.
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Now, Blu-ray is in a newer optical format,
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and in that format is
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a single layer which was about 25 gigabytes of data.
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Now the name Blu-ray actually comes from the light
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that is emitted from the optical reader itself.
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It's a blue or violet laser
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that raised the disk and his format and allows
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information to be stored at
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a greater density than possible
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with a longer wavelength red laser use for DVDs.
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This was a newer technology that allowed
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more data to be written to those disk, 25 gigabytes.
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Then in this family,
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we also have the BD-Rs,
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which is the recordable optical format for the Blu-ray,
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then the BD-REs and this is the Blu-ray,
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read, erase, and rewritable version.
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We've went over and talked about the CD-ROM and
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the CD-RWs and how we step from there to the DVD ROMs,
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DVD-RWs, and the DVD dual layers,
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and we finished talking about the Blu-rays,
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BD-Rs, and the BD-REs.
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Again, just a brief overview of
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these optical formats and the optical drives,
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just to get you a basic understanding,
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so you're ready for the Comp TIA.
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That concludes our lesson for today,
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and we will see you in the next lesson.
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