A computer has basically two types of memory.
There's primary memory and secondary memory. Now primary memory is temporary, which is
RAM. But secondary memory is permanent, and this deals with storage drives. Now every
computer needs a place to store their data. Whether that data is photos, documents, video,
and audio files, or an operating system, a computer needs a place to store this
data internally on a storage drive. And these drives also need to be non-volatile,
which means that they will retain the data even if the power is turned off. And there are
different types of internal storage drives that a computer uses. And these drives could be magnetic
hard drives, solid state drives, or hybrid drives. So let's first talk about magnetic hard drives.
Now magnetic hard drives have been around since the beginning of computers. They were introduced
by IBM in 1956 and even though they've been around for a long time, they are still used today. The
hard disk drive is a sealed case that contains magnetic disks and these disks is where the
actual data is stored on. These disks rotate at high speeds and as they do, the actuator arm will
either write data to the disks or read data from the disks, depending upon what the user wants to
do. These magnetic disks can rotate at high speeds of either 5400, 7200, or 10,000 RPM. The typical
hard drive that's used today in desktop computers operates at the 7200 RPM range. A cheaper
desktop hard drive operates at 5400 RPM, which is also the speed of a typical laptop hard
drive. Higher-end hard drives would operate at 10,000 RPM. However, these higher-end
hard drives are not commonly used anymore because of the advanced speeds of solid state
drives, which we'll talk about next. Hard drives today use the serial ATA interface. Now this
is a newer standard that is faster than the outdated parallel ATA interface. So instead
of data traveling in a parallel path, the data travels in a serial path, which means
that the data travels one bit at a time. SATA drives have transfer speeds of averaging 6
gigabits per second, which is considerably faster than the old parallel ATA. And hard drives
also come in two physical sizes. They come in 3.5 or 2.5 inches. 3.5 inch drives is what desktop
computers and servers will use and 2.5 inch drives is what laptops will use. Another type of storage
device is called an SSD or solid state drive. Now these drives have no moving parts. So instead
of using magnetic disks, these drives use flash memory chips to store data. So the data transfer
is very fast. And in addition, since they have no moving parts, they are also very quiet and more
energy efficient. SSDs also come in different form factors. They would come in a standard 2.5
inch rectangular form factor or they would come in the newer M.2 form factor. Now both of these
drives store data on flash memory but they connect to the motherboard using different interfaces. The
standard 2.5 inch SSD uses the SATA interface just like a hard drive and the M.2 SSD would plug
into an M.2 slot. And if you want to know more about the M.2 SSD, I did a whole video about
it and I'll link it at the end of this video. SSDs are also more resistant to physical shock
compared to hard drives, whereas if you were to physically shock a hard drive, such as dropping it
or jolting your computer, it could crash the drive and your data would be lost. SSDs are also more
expensive than hard drives, but you do get what you pay for, because they are considerably faster
and you'll see a big difference in the performance of your computer. And they can also be used on
both desktop and laptop computers. Now because of the price difference between SSDs and hard drives,
a lot of times if you were to buy a new computer, the computer may come with both an SSD drive
and a hard drive. The faster SSD would be a smaller capacity drive that would contain any data
that would benefit from speed and that you would access frequently, such as the operating system,
programs, and documents. And the slower hard drive would be a larger capacity drive that would be
used for secondary storage. For example, to store data that you would access less frequently or the
drive would be used to store large files such as videos. Now you could buy or build a computer
with one large SSD for all of your storage, but that would significantly increase the price
of the computer and it's almost pointless to have files that you infrequently access on an SSD. So
this is why, to save money, computers will use both an SSD and a hard drive. Now there is
also a solution where you can have an SSD and a hard drive as one physical drive instead
of two separate drives. And these are called SSHD or solid state hybrid drives. Now these
drives combine the use of magnetic disks and flash memory. Hybrid drives take advantage of the
large capacity and the low cost of magnetic disks, with the speed of an SSD. In a hybrid drive,
the magnetic disks would be used to store data, while the flash memory would be used for the
caching of the data. And these drives are pretty much automatic. The firmware in the drive
will actually learn and decide by itself as to where the data will be stored. The files that are
accessed frequently, will be cached and stored on the flash memory, while the infrequently
used data will be stored on the disks. So everyone just remember, no matter which drive
you use, all drives will crash at one point just because of wear and tear. And you should always
back up your data. I personally use IDrive to backup my data and it backs up everything to the
cloud. I've tried a few different backup programs but i think IDrive is the best and I'll put a
link in the description below of this video if you're interested in getting it. IDrive has not
contacted me, I'm not getting paid to say this, this is just what I use and recommend and I do
get a small percentage of a sale. So thank you for watching this video and please
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