File1, 2, & 3 for oali:


INFO300

File1:

SSD stands for Solid State Drive. You’re probably familiar with USB memory
sticks - SSD can be thought of as an oversized and more sophisticated
version of the humble USB memory stick. Like a memory stick, there are no
moving parts to an SSD. Rather, information is stored in microchips.
Conversely, a hard disk drive uses a mechanical arm with a read/write head
to move around and read information from the right location on a storage
platter. This difference is what makes SSD so much faster. As an analogy,
what’s quicker? Having to walk across the room to retrieve a book to get
information or simply magically having that book open in front of you when
you need it? That’s how an HDD compares to an SSD; it simply requires
more physical labor (mechanical movement) to get information.

File2:

A typical SSD uses what is called NAND-based flash memory. This is a non-
volatile type of memory. What does non-volatile mean you ask? The simple
answer is that you can turn off the disk and it won’t “forget” what was
stored on it. This is of course an essential characteristic of any type of
permanent memory. An SSD does not have a mechanical arm to read and write
data, it instead relies on an embedded processor (or “brain”) called a
controller to perform a bunch of operations related to reading and writing
data. The controller is a very important factor in determining the speed of
the SSD. Decisions it makes related to how to store, retrieve, cache and
clean up data can determine the overall speed of the drive.

File3:

Hard Disk Drive (HDD) were first introduced by IBM in 1956 - yes folks this is
nearly 60-year old technology. An HDD uses magnetism to store data on a
rotating platter. A read/write head floats above the spinning platter reading
and writing data. The faster the platter spins, the faster an HDD can perform.
Typical laptop drives today spin at either 5400 RPM (Revolutions per Minute)
or 7200RPM, though some server-based platters spin at up to 15,000 RPM!

The major advantage of an HDD is that it is capable of storing lots of data
cheaply. These days, 1 TeraByte (1,024 gigabytes) of storage is not unusual
for a laptop hard drive, and the density continues to grow. However, the cost
per gigabyte is hard to calculate now-a-days since there are so many classes
to consider, though it is safe to say that all HDDs are substantially cheaper
than SSDs. As a comparison, the popular WD Black (1TB) goes for roughly $69 on
most websites while the OCZ Trion 100 (960GB) and Samsung 850 EVO (1TB) SSDs
go for $199 and $319 respectively, three to five times the price of the WD
Black. So if you want cheap storage and lots of it, using a standard hard
drive is definitely the more appealing way to go.

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