10 hours 41 minutes
this section will talk about removable media
was removable media. It's any mass storage device that can remove from one system and inserted into another, and we're talking physically, not as an over the network.
So anyway, that you can remove data physically from one computer and add it to another.
Common media tapes include floppy flash optical, which are see Rahm drives and the various formats for she Rahm
and external drives.
So the floppy kind of our first
peces first removable
media I wouldn't say it was mass storage device like we did in the last slide, but it's still for its time. It was mass storage.
Most common was the three and 1/2 floppy like you see in this picture
you have been using appears a really long time before. That is the five and 1/4 which was an actual floppy. It actually
actually flop when you shook it as posted this three and 1/2 inches. In a hard case,
1.44 megabytes is how much could hold
before networks. And even before we had a lot of hard drives, floppies were the only way you could move data
between computers, sometimes it was really large. You have to split it up across multiple floppies.
So to install no es, it wasn't uncommon that you'd have three or four floppies that you have to put in one after the other.
They're very slow
there, there, my mechanical in network in nature. A lot like a very simple hard drive. It's a single little magnetic disk inside that spins.
They were out for a really long time, even though we were using from data storage. We're still using them for installing a less is before see ROM's and then USB drives. So you almost had to have a floppy, even though you never used it for anything but
having to install a new operating system on your computer.
If you have a need for floppies today, they do make external floppy drives a check through a USB port.
For whatever reason, you found an old file. You were converting a stack of us be stack of floppy drives
onto your hard drive.
The next talk about flash memory, which is by the most common
uses memory chips that could be a race and formatted
for our purposes. We're going to fight him into two groups, thumb drives and memory cards,
so the thumb drive off to notice flash or jump drives.
Easy way to transfer data between machines.
Now, since they've replaced floppies, weaken boot off them so you could have your entire OS insulation on a flash drive and boot office. So there's no more even having to change CDs. You can do everything off of one of their fastest removable media we're gonna talk about
now. They match the speed of the U. S. B port, so now you can buy us B three
flash drives that will go.
They'll find any USB port, But if you have a USB three pour on your computer, you can get the full speed of us be three.
Most them are still USB two,
and they have no need for external power supply, so they get their power from us. B.
Flashcards are used to store data on small or mobile devices.
There's quite a few kinds. We have the compact flash, smart, secure digital memory stick and X D picture card.
Now, unlike the US, beat the flash drives or sometimes called USB sticks, you can plug those right into a USB port and you're good to go with flash cards. Need to have some kind of
reader that matches the flashcard content type.
So some laptops will have maybe an SD card. The secure digital one might have an SD card reader on them. Bill 10
uh, most of time for PCs. They're not gonna have a reader, and you need to have you have to buy an external
esta an external flash card reader, which would plug in through
a USB port.
So the first kind of flash that our last, the first kind of flash car that came out with the compact flash
you see, it's quite kind of bulky
came in two sizes. CF Combat Flash one and two to was a lot thicker than the other.
Then I won.
They also when they make contact flash. So we start having compact flash readers out. And they they were. Some early laptops had compact flash readers.
There wasn't proprietary
compact ah, a proprietary format called Micro Drive that was introduced, which is basically used. The compact flash format, such as you could see the size here. This isn't this into scale. They're a lot smaller,
and it basically put a tiny mechanical hard drive inside,
so a tiny spindle in tiny hat. And then when you plug it into
the same kind of slot you would the CF, the compact flash card it would. It would operate like a hard drive.
It wasn't very successful, and flash technology came such a long way. That was a very
relevant So and then it got bought out by a couple companies, and they're no longer
Smart, Medio developed compete with the compact flash. That's where we start moving up to our SD disk, our secure digital
They're a lot smaller, significantly smaller than the compact flash, and there are a lot faster
you started seeing. So the first,
the first digital cameras, actually used compact flash in them. But
that's that's a lot of space taken up in a digital camera toe. Hold
memory to store your photos on, so that really drove a lot of this smart media technology.
So now you see most devices. Most mobile devices, including cameras, have some kind of
smart media card like this in a
most common CST, the original SD cards of the most.
We're even small, so
they made even smaller versions of the SD card down to Mini and Micro Rusty. So you've seen the picture. So here's a typical SD card.
There's a many one little bit smaller and then micro
is really I mean, it's it's tiny microbes what you're most commonly see in cell phones.
Now what they've done for some of these, like the micro, is they've made him so that they could be read into other formats. So in this case, this is an adapter for micro. So if you don't have
most PCs and most media card readers won't have a micro reader, so what would happen is you'd slide this little micro
as this micro card
into the bottom of an adapter like this one and this in many one, so this would fit into a mini slot.
So So you don't have to have a card reader for each individual type. They made him so that he could
having adapter form when you want to read data often don't like something like a PC,
different kinds of secure disk. The 1st 1 was a standard S D, which would range from four megabytes before gigs,
and then we had sth See High Capacity, which brought us up with 32 gigabits, and now we see the CD xsi extended capacity, which can reach up to two terabytes.
Amazing when you think two terabytes fitting into something the size of one of these SD cards compared to what we started off with Compact flash
and the size of these
now Memory Stick was a Sony or is
a silly, proprietary form
of the SD card.
The standard 128 Pro was four gigs, and we could all the Reps and Marco were just 16 gigs,
but only Sony makes him, and
they're pretty much only used in Sony products. Sell Sony cameras
and so the laptops and probably would have readers for this
do that hasn't become very prevalent. The market except if you use a lost so many technology.
The extreme digital picture card half the size of standard SD card,
mainly used by for digital cameras, usually high end digital cameras.
The reason for this was the speed and the size
digital cameras near lost speed. If you're your average photographer, a professional photographer may take a lot of pictures in a row really fast and
the car had to be to keep up that speeds. They started developing card specifically for photography that could keep up with
taking a lot of photos at high speed
come in three formats. The original, which is faster than standard
and high speed type H fashion. Standing original
when looking at um, when looking at SD cards, especially if you're using them for certain devices, you should consult the manual for that device, especially if it's like a camera.
So certain cameras may say you need a certain type like you might need a type H or you might need
high capacity. Or instead of capacity, they will stay in the manual what kind of stick you need. But if you do it for general purpose,
it won't be as much concerned. But
and I will talk about optical drives
when we say optical drives really talk about CDs, DVDs, Blue Ray
technologies based off a laser light or electromagnetic wave to read the reading right off the disc.
What happens is the data stored on the CD via
so you have a piece of plastic that has little bits of microscopic
highs and lows or little pits inside them What the laser does. The laser reads those pits and translates those into ones and zeroes. So they're written. Pits are written in a
predetermined format that could be reread digitally.
Does a regular CD. We're just talking about our cities? Daz. Uh, it's only stored on one side of the disc
a couple different formats for CDs. We have the C d D A, C rahm
CDR and C R W. So CD is rideable and CD R W is rewriteable.
So C D D A. Was the format developed for audio CDs
wasn't ideal for storing data,
so we didn't have air checking fall support, Didn't have to have it, Didn't have to have a file system. Didn't have to have any kind of data structure,
just had to be ableto
store audio and track information.
Then we came alone for actually storing data like Hey, so it came out first for audio using CD a one. Hey, we could figure out a way to storm more debt on this and use these and computers.
So when used for data, I see Deacon hold a standard CD can hold up to 700 megabytes of data
he's was called the I s 09660 file system, which is
a false system. Four developed four CD so that you could use them between
different kinds of OS is
cause, like legs. We use a different different file system away, a different wayto store files and different way to read files and say windows
or or another UNIX based system. So, using the ISA s 0960 standard,
you could put a CD in any of these systems and be able to read it.
yet to have a drive that support it. Most CDs or just most CD drives when they first came out, were read only.
And then as the technology evolved, we started getting rideable drives.
Rideable Dr Can still read a CD, but it means it can also write to the city.
It does this by using lasers to heat up the organic die that's embed on the CD are disc.
Now we're talking CDR that's burned once. We can only burn once they can't be erased.
So then came Cdr W's, which allowed us to read and write
multiple times. So instead of a CD R, which we could only write to once. Now we had
our W's, which we could rewrite to only downside to. It was they were slow.
And when I say right, weaken, same for CD ours. We could also write not just data, but we could also make our own audio CDs
following the CD a standard.
The next step in the evolution of the CD was a DVD,
but this ghost or up to 16 gigabytes of data
supposed to 700 meg that we had on a traditional CD
could also play DVD videos.
Just like the regular CD got start as an audio format. The DVD got start with a video format.
Most drives come with most PCs will come with a DVD drive.
The DVD drive can still read
audio CDs, can still read regular
data CDs and can still read
CD rewriteable Sze
so they're still backwards compatible,
which was important to making it successful.
I said, Really. Reese, originally released to do video
support up to about two hours, these air double sided
So the early DVDs don't remember original DVDs. You'd watch a movie, and halfway through the movie, you have to
flipped the DVD over to watch the other side to watch. The rest of movie compression has gotten better, so we don't do that anymore. But
use the same concept of the CD where there's pits that translate into ones and zeroes.
But they're more condensed, so we could fit more information on a CD or on a DVD.
Two main formats, single side, where we're just looking at one and double sided, where you're burning on both sides. Or there's data on both sides of the disc,
and then they also introduced single layer and dual layer. And this helps solve a lot of the issues with having to flip the CD over also, so a dual air we had. They introduce an additional layer of pits onto the CD
by focusing the beam different when it's reading, so it'll be reading at one.
well, we really would layer pits, and it'll re focus the beam to a different size and can read a different layer of pits in the CD or a DVD in this case.
So we went to this technology you could when it was new. You could tell when it's start. When the laser refocused. Could you see a pause in the video.
When you're watching a DVD, it see a slight pause because it would have to refocus, layered and see the next layer of hits on the disk.
So here the common, uh, here the storage formats. So we have DVD five,
which was the original
4.37 Gates could hold our little over two hours of video. It was single sided and single layer.
Then we got to eight gigs. We could hold up to four videos,
single sided and dual A. Uh,
that dual layer,
uh, 10 could do 8.74 gigs.
It was double cited in single layer, and then 18 is both dual sided in dual layered and supported almost up to 16 gigs with over eight hours of video.
So then, after DVDs, the next one that came with Blue Ray,
who raised the current CD ROM technology of choice.
I did this by utilizing a different kind of laser to read
the pits on the disc used a blue violet laser, which was more precise.
It all supports more compressions standards for video, so you could put more video without losing quality onto a disk
So with the dual layer blue ray, we get up to 50 50 gigabytes sets. A
came in two sizes, standard in many.
Many were about half the size for less capacity, but you could do them in camcorders.
So DVD rums are pretty standard computers, blue rays or not as common. There's still a little more expensive.
You know, I guarantee, to give you Ray and all
PCs, or even in all laptops, unless you specifically ask for it
or pay for it.
And just like with the DVD, the blue ray is backwards compatible,
so it could still read DVDs and CDs.
And just like with CDs and DVDs, they came up with a recordable and a rewriteable format.