let's move on and look at storage. So we're going to look both that volatile storage that is RAM and non volatile storage such as CDs, DVDs and hard drives.
So looking at Dr First,
the type of Orion Muse currently is called SD RAM, which stands for synchronous dynamic graham.
It is so called because with the first generation of brand modules, clock cycles were not synchronized with that of the CPU,
and this resulted in delays in getting data in and out of RAM.
Since the introduction of SD Rhyme,
it has evolved into ever faster versions.
DD Hour roughly doubled the effective speed of memory
dd out to effectively doubled the speed of DD our and saw.
There is also a smaller form factor for memory modules called S O Dim.
This is designed for the much smaller space available in laptops.
As I mentioned earlier, the sockets for the memory modules have plastic clips on either side
that lock the models in place as you pushed them into the slot.
Now, just because I module physically fits into a socket
should not be taken to me that they are all interchangeable.
Memory modules will only fit in the slot design for that type of memory.
DDR two is physically different from D. D. L three, for example.
But even if it fits,
you still have to verify that the motherboard supports the type of module.
For example, there is such a thing as error correcting RAM called E C C Ram,
and there is another type called buffered or registered memory,
and many of other boards do not support these.
There may also be restriction in the bios of the computer as to how much memory is supported in total.
And your operating system may also place a limit on how much memories supported.
For example, if you install 32 bit windows,
it can only use four gigabytes of rap
regardless of how much RAM you actually install on the motherboard.
Now let's take a look at mass storage devices such as hard discs and DVDs.
And remember, these are non volatile, so the data is not lost when you turn off the power.
One type of removable mass storage are optical discs, such a CDs or DVDs.
Optical drives used the same power and data connectors as hard disks.
You'll need two cables, one that powers the drive and one for the data connection.
Hard disks come in three standard sizes.
3.5 inch disks are typically installed in desktop computers
for laptops to smaller sizes are available to 0.5 inch, and 1.8 inch
hard disk can provide many terabytes of storage.
Currently, four terabyte hard disks are starting to become common and retail for around $100.
Hard disk consists of metallic platters that spinning at a fast rate.
There is an arm that moves across the platters and can read and write data to the platters
that head floats above the platter on a hard knock to the disc and make it hit the platter and damage it
so hard. Disks are relatively fragile and easy to damage.
Note, by the way, that we are showing you the insides of a hard disk.
But if you were to open up the hard disk like this,
that would void the warranty, and more importantly, it may allow tiny bits of dust to get in between the head and the platter,
scratching the platter.
Normally, hard disk has a tiny hole to allow Aaron, but through a filter that keeps out the dust.
Consumer level hard disks spin at 5400 revolutions per minute or rpm's
premium hard disks for workstations. Spend at 7200 rpm,
but at the server and you can get disks that can spin a 10,000 rpm and even 15,000 rpm.
And generally speaking, the faster the platter spins, the faster you can read and write data to the desk.
Solid state drives have no moving parts and so are not as fragile as mechanical drives.
Instead, they stored data in non volatile memory.
SST is also its tail. ST. Discs are silent because there are no moving parts.
They use less power than mechanical hard disks
on our very fast compared to mechanical drives.
So why don't we just use SS days all the time?
they are much more expensive per megabyte than mechanical drives.
Eventually, though, they should become cheaper than mechanical drives.
SST is come in many different form factors. Some are just circuit boards, and this is called M too.
But they are also available in the same form factors as mechanical hard disks, 3.5 inch, 2.5 inch and 1.8 Ege,
so therefore they can fit in the same bays as a mechanical heart desk,
and they used the same connectors as mechanical heart discs.
Now, as far as these connectors go,
the original type of connector was called I D E.
This was this is today considered a legacy connection method.
This is also known as a ta advanced technology attachment or even P a T A parallel.
So with this, you had the socket that you can see up there in the motherboard,
and then the blue end of the cable here would plug into that socket
at the other end of the socket,
there were usually too connectors.
So this means that single cable
coming from a single port
could actually support to drives rather than just one Dr.
But the latest technology is Satya Serial advanced Technology attachment.
Most storage devices today connect using satya sockets on the motherboard.
So here you can see the six black sockets. They are Satur socket,
and that's what a satyr cable looks like. An Assad, a connector that plugs into those sockets.
Mass storage devices are powered by cables coming from the power supply,
so I d drives the older technology
uses what I called Molex connectors. So that's that white plug you see with four pins in it,
and Sutter drives used the Sutter Power connectors.
Now, if your computer doesn't have the right type of connector for the type of Dr you're trying to install, you can get converted cables.
For example, you can get a cable that converts from Molex to the Sutter Power connector.
So let's have a look at installing a couple of drives.
I pulled out the cables out of the computer case to show you more clearly.
Here is an old I D. Drive. There is the power connection socket.
So I'm plugging in the data cable now,
there's the Molex Power connector.
So we plugged that in into the appropriate socket,
and now we can physically installed the disc in a drive baby.
And here is the newer Sutter
interface on a desk.
So here's my satyr power collector,
and this just plugs into the appropriate slot
and there is the Satya data connector.
Having connected those, I simply have to again install it into an appropriate bait